// Copyright 2025 The Chromium Authors // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #include "content/browser/preloading/preload_serving_metrics.h" #include #include "base/strings/strcat.h" #include "base/test/metrics/histogram_tester.h" #include "base/test/scoped_feature_list.h" #include "content/browser/preloading/prefetch/prefetch_match_resolver.h" #include "content/browser/preloading/prerender/prerender_features.h" #include "content/common/features.h" #include "content/public/browser/preloading.h" #include "testing/gtest/include/gtest/gtest.h" namespace content { struct MakeSkeltonPreloadServingMetricsArgs { int n_prefetch_match_metrics; }; std::unique_ptr MakeSkeletonPreloadServingMetrics( MakeSkeltonPreloadServingMetricsArgs args) { auto ret = std::make_unique(); for (int i = 0; i < args.n_prefetch_match_metrics; ++i) { ret->prefetch_match_metrics_list.push_back( std::make_unique()); } return ret; } base::TimeTicks Millis(int ms) { return base::TimeTicks() + base::Milliseconds(ms); } void ExpectFCP(const base::HistogramTester& histogram_tester, const std::string& suffix, std::optional fcp) { const std::string name = base::StrCat({"PreloadServingMetrics.PageLoad.Clients.PaintTiming." "NavigationToFirstContentfulPaint.", suffix}); if (fcp) { histogram_tester.ExpectUniqueTimeSample(name, base::Milliseconds(*fcp), 1); } else { histogram_tester.ExpectTotalCount(name, 0); } } // Scenario: // // - Navigation A started. // - A committed. TEST(PreloadServingMetricsTest, NavigationWithoutPreload) { base::test::ScopedFeatureList feature_list; feature_list.InitWithFeaturesAndParameters( { { features::kPrerender2FallbackPrefetchSpecRules, { }, }, }, {}); base::HistogramTester histogram_tester; auto log = MakeSkeletonPreloadServingMetrics({.n_prefetch_match_metrics = 0}); log->is_prerender_aborted_by_prerender_url_loader_throttle = false; log->prerender_initial_preload_serving_metrics = nullptr; log->RecordMetricsForNonPrerenderNavigationCommitted(); log->RecordPreloadServingMetricsByNavigationInitiator( /*did_nav_use_bfcache=*/false, /*is_served_by_legacy_search_prefetch=*/false, "Other", /*is_url_srp=*/false); log->RecordFirstContentfulPaint(base::Milliseconds(334), /*is_in_foreground=*/true, /*is_served_by_legacy_search_prefetch=*/false, "Other", /*is_url_srp=*/false); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics.Count", 0, 1); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "IsPotentialMatch", 0, 1); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "PotentialMatchThen.NumberOfInitialCandidates", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "PotentialMatchThen.NumberOfInitialCandidatesBlockUntilHead", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "PotentialMatchThen.IsActualMatch", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "PotentialMatchThen.PotentialCandidateServingResult.Last", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "PotentialMatchThen.MatchDuration", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "PotentialMatchThen.MatchDuration.ForActualMatch", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "PotentialMatchThen.MatchDuration.ForNotActualMatch", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "ActualMatchThen.TimeFromPrefetchContainerAddedToMatchStart", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "IsPotentialMatch.WithAheadOfPrerender", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "PotentialMatchThen.WithAheadOfPrerender.PotentialCandidateServingResult", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.Count", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.IsPotentialMatch", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.PotentialMatchThen.NumberOfInitialCandidates", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.PotentialMatchThen." "NumberOfInitialCandidatesBlockUntilHead", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.PotentialMatchThen.IsActualMatch", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.PotentialMatchThen.PotentialCandidateServingResult." "Last", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.PotentialMatchThen.MatchDuration", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.PotentialMatchThen.MatchDuration.ForActualMatch", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.PotentialMatchThen.MatchDuration.ForNotActualMatch", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.ActualMatchThen." "TimeFromPrefetchContainerAddedToMatchStart", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.IsPotentialMatch.WithAheadOfPrerender", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.PotentialMatchThen.WithAheadOfPrerender." "PotentialCandidateServingResult", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.Count", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.IsPotentialMatch", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.PotentialMatchThen.NumberOfInitialCandidates", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.PotentialMatchThen." "NumberOfInitialCandidatesBlockUntilHead", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.PotentialMatchThen.IsActualMatch", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.PotentialMatchThen.PotentialCandidateServingResult." "Last", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.PotentialMatchThen.MatchDuration", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.PotentialMatchThen.MatchDuration.ForActualMatch", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.PotentialMatchThen.MatchDuration.ForNotActualMatch", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.ActualMatchThen." "TimeFromPrefetchContainerAddedToMatchStart", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.IsPotentialMatch.WithAheadOfPrerender", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.PotentialMatchThen.WithAheadOfPrerender." "PotentialCandidateServingResult", 0); ExpectFCP(histogram_tester, "WithoutPreload", {334}); ExpectFCP(histogram_tester, "WithPrefetch", {}); ExpectFCP(histogram_tester, "WithPrerender", {}); ExpectFCP(histogram_tester, "All.All.All", {334}); ExpectFCP(histogram_tester, "All.All.NoInstantLoad", {334}); ExpectFCP(histogram_tester, "All.All.Prefetch", {}); ExpectFCP(histogram_tester, "All.All.Prerender", {}); ExpectFCP(histogram_tester, "Other.All.All", {334}); ExpectFCP(histogram_tester, "Other.All.NoInstantLoad", {334}); ExpectFCP(histogram_tester, "Other.All.Prefetch", {}); ExpectFCP(histogram_tester, "Other.All.Prerender", {}); ExpectFCP(histogram_tester, "WithoutFiltering.All.All.All", {334}); ExpectFCP(histogram_tester, "WithoutFiltering.All.All.NoInstantLoad", {334}); ExpectFCP(histogram_tester, "WithoutFiltering.All.All.Prefetch", {}); ExpectFCP(histogram_tester, "WithoutFiltering.All.All.Prerender", {}); ExpectFCP(histogram_tester, "WithoutFiltering.Other.All.All", {334}); ExpectFCP(histogram_tester, "WithoutFiltering.Other.All.NoInstantLoad", {334}); ExpectFCP(histogram_tester, "WithoutFiltering.Other.All.Prefetch", {}); ExpectFCP(histogram_tester, "WithoutFiltering.Other.All.Prerender", {}); histogram_tester.ExpectUniqueSample("PreloadServingMetrics.Other.All", 0 /* kNoInstantLoad */, 1); histogram_tester.ExpectTotalCount("PreloadServingMetrics.Other.SRP", 0); } // Tests that FCP metrics with foreground filtering are not recorded for // background navigations. // // Scenario: // // - Navigation A committed. // - FCP occurred in background. TEST(PreloadServingMetricsTest, NavigationWithoutPreloadInBackground) { base::HistogramTester histogram_tester; auto log = MakeSkeletonPreloadServingMetrics({.n_prefetch_match_metrics = 0}); log->is_prerender_aborted_by_prerender_url_loader_throttle = false; log->prerender_initial_preload_serving_metrics = nullptr; log->RecordMetricsForNonPrerenderNavigationCommitted(); log->RecordPreloadServingMetricsByNavigationInitiator( /*did_nav_use_bfcache=*/false, /*is_served_by_legacy_search_prefetch=*/false, "Other", /*is_url_srp=*/false); log->RecordFirstContentfulPaint(base::Milliseconds(334), /*is_in_foreground=*/false, /*is_served_by_legacy_search_prefetch=*/false, "Other", /*is_url_srp=*/false); ExpectFCP(histogram_tester, "WithoutPreload", {334}); ExpectFCP(histogram_tester, "WithPrefetch", {}); ExpectFCP(histogram_tester, "WithPrerender", {}); ExpectFCP(histogram_tester, "All.All.All", {}); ExpectFCP(histogram_tester, "All.All.NoInstantLoad", {}); ExpectFCP(histogram_tester, "All.All.Prefetch", {}); ExpectFCP(histogram_tester, "All.All.Prerender", {}); ExpectFCP(histogram_tester, "Other.All.All", {}); ExpectFCP(histogram_tester, "Other.All.NoInstantLoad", {}); ExpectFCP(histogram_tester, "Other.All.Prefetch", {}); ExpectFCP(histogram_tester, "Other.All.Prerender", {}); ExpectFCP(histogram_tester, "WithoutFiltering.All.All.All", {334}); ExpectFCP(histogram_tester, "WithoutFiltering.All.All.NoInstantLoad", {334}); ExpectFCP(histogram_tester, "WithoutFiltering.All.All.Prefetch", {}); ExpectFCP(histogram_tester, "WithoutFiltering.All.All.Prerender", {}); ExpectFCP(histogram_tester, "WithoutFiltering.Other.All.All", {334}); ExpectFCP(histogram_tester, "WithoutFiltering.Other.All.NoInstantLoad", {334}); ExpectFCP(histogram_tester, "WithoutFiltering.Other.All.Prefetch", {}); ExpectFCP(histogram_tester, "WithoutFiltering.Other.All.Prerender", {}); } // Scenario: // // - Navigation A started. // - A committed. // - A entered BackForwardCache. // - Navigation B is started and used A, which is restored from // BackForwardCache. TEST(PreloadServingMetricsTest, NavigationWithBFCacheRestore) { base::HistogramTester histogram_tester; auto log = MakeSkeletonPreloadServingMetrics({.n_prefetch_match_metrics = 0}); log->is_prerender_aborted_by_prerender_url_loader_throttle = false; log->prerender_initial_preload_serving_metrics = nullptr; log->RecordMetricsForNonPrerenderNavigationCommitted(); log->RecordPreloadServingMetricsByNavigationInitiator( /*did_nav_use_bfcache=*/true, /*is_served_by_legacy_search_prefetch=*/false, "Other", /*is_url_srp=*/false); // Note: `RecordFirstContentfulPaint` is not called for BFCache restore // because `PreloadServingMetricsPageLoadMetricsObserver` does not handle // `OnFirstPaintAfterBackForwardCacheRestoreInPage` (and BFCache restore only // provides FirstPaint, not FirstContentfulPaint). histogram_tester.ExpectUniqueSample("PreloadServingMetrics.Other.All", 3 /* kBFCache */, 1); histogram_tester.ExpectTotalCount("PreloadServingMetrics.Other.SRP", 0); } // Scenario: // // - Navigation A started to a search result page (SRP). // - A committed. TEST(PreloadServingMetricsTest, NavigationWithSRP) { base::HistogramTester histogram_tester; auto log = MakeSkeletonPreloadServingMetrics({.n_prefetch_match_metrics = 0}); log->is_prerender_aborted_by_prerender_url_loader_throttle = false; log->prerender_initial_preload_serving_metrics = nullptr; log->RecordMetricsForNonPrerenderNavigationCommitted(); log->RecordPreloadServingMetricsByNavigationInitiator( /*did_nav_use_bfcache=*/false, /*is_served_by_legacy_search_prefetch=*/false, "Other", /*is_url_srp=*/true); log->RecordFirstContentfulPaint(base::Milliseconds(334), /*is_in_foreground=*/true, /*is_served_by_legacy_search_prefetch=*/false, "Other", /*is_url_srp=*/true); ExpectFCP(histogram_tester, "All.All.All", {334}); ExpectFCP(histogram_tester, "All.All.NoInstantLoad", {334}); ExpectFCP(histogram_tester, "All.SRP.All", {334}); ExpectFCP(histogram_tester, "All.SRP.NoInstantLoad", {334}); ExpectFCP(histogram_tester, "Other.All.All", {334}); ExpectFCP(histogram_tester, "Other.All.NoInstantLoad", {334}); ExpectFCP(histogram_tester, "Other.SRP.All", {334}); ExpectFCP(histogram_tester, "Other.SRP.NoInstantLoad", {334}); ExpectFCP(histogram_tester, "WithoutFiltering.All.All.All", {334}); ExpectFCP(histogram_tester, "WithoutFiltering.All.All.NoInstantLoad", {334}); ExpectFCP(histogram_tester, "WithoutFiltering.All.SRP.All", {334}); ExpectFCP(histogram_tester, "WithoutFiltering.All.SRP.NoInstantLoad", {334}); ExpectFCP(histogram_tester, "WithoutFiltering.Other.All.All", {334}); ExpectFCP(histogram_tester, "WithoutFiltering.Other.All.NoInstantLoad", {334}); ExpectFCP(histogram_tester, "WithoutFiltering.Other.SRP.All", {334}); ExpectFCP(histogram_tester, "WithoutFiltering.Other.SRP.NoInstantLoad", {334}); histogram_tester.ExpectUniqueSample("PreloadServingMetrics.Other.All", 0 /* kNoInstantLoad */, 1); histogram_tester.ExpectTotalCount("PreloadServingMetrics.Other.SRP", 1); } // Scenario: // // - Navigation A started to a search result page (SRP). // - Navigation A was served by legacy search prefetch. // - A committed. TEST(PreloadServingMetricsTest, NavigationWithLegacySearchPrefetch) { base::HistogramTester histogram_tester; auto log = MakeSkeletonPreloadServingMetrics({.n_prefetch_match_metrics = 0}); log->is_prerender_aborted_by_prerender_url_loader_throttle = false; log->prerender_initial_preload_serving_metrics = nullptr; log->RecordMetricsForNonPrerenderNavigationCommitted(); log->RecordPreloadServingMetricsByNavigationInitiator( /*did_nav_use_bfcache=*/false, /*is_served_by_legacy_search_prefetch=*/true, "Other", /*is_url_srp=*/true); log->RecordFirstContentfulPaint(base::Milliseconds(334), /*is_in_foreground=*/true, /*is_served_by_legacy_search_prefetch=*/true, "Other", /*is_url_srp=*/true); ExpectFCP(histogram_tester, "WithPrefetch", {334}); ExpectFCP(histogram_tester, "WithoutPreload", {}); ExpectFCP(histogram_tester, "WithPrerender", {}); ExpectFCP(histogram_tester, "All.All.All", {334}); ExpectFCP(histogram_tester, "All.All.Prefetch", {334}); ExpectFCP(histogram_tester, "All.SRP.All", {334}); ExpectFCP(histogram_tester, "All.SRP.Prefetch", {334}); ExpectFCP(histogram_tester, "Other.All.All", {334}); ExpectFCP(histogram_tester, "Other.All.Prefetch", {334}); ExpectFCP(histogram_tester, "Other.SRP.All", {334}); ExpectFCP(histogram_tester, "Other.SRP.Prefetch", {334}); ExpectFCP(histogram_tester, "WithoutFiltering.All.All.All", {334}); ExpectFCP(histogram_tester, "WithoutFiltering.All.All.Prefetch", {334}); ExpectFCP(histogram_tester, "WithoutFiltering.All.SRP.All", {334}); ExpectFCP(histogram_tester, "WithoutFiltering.All.SRP.Prefetch", {334}); ExpectFCP(histogram_tester, "WithoutFiltering.Other.All.All", {334}); ExpectFCP(histogram_tester, "WithoutFiltering.Other.All.Prefetch", {334}); ExpectFCP(histogram_tester, "WithoutFiltering.Other.SRP.All", {334}); ExpectFCP(histogram_tester, "WithoutFiltering.Other.SRP.Prefetch", {334}); histogram_tester.ExpectUniqueSample("PreloadServingMetrics.Other.All", 1 /* kPrefetch */, 1); histogram_tester.ExpectUniqueSample("PreloadServingMetrics.Other.SRP", 1 /* kPrefetch */, 1); } // Scenario: // // - Prefetch A is triggered. // - Navigation B started. // - B is blocked by A. // - A succeeded. // - It unblocks B. // - B committed. TEST(PreloadServingMetricsTest, NavigationWithPrefetch) { base::test::ScopedFeatureList feature_list; feature_list.InitWithFeaturesAndParameters( { { features::kPrerender2FallbackPrefetchSpecRules, {}, }, { features::kPrefetchOffTheMainThread, {}, }, }, {}); base::HistogramTester histogram_tester; auto log = MakeSkeletonPreloadServingMetrics({.n_prefetch_match_metrics = 1}); log->prefetch_match_metrics_list[0]->time_match_start = Millis(42); log->prefetch_match_metrics_list[0]->time_match_end = Millis(57); log->prefetch_match_metrics_list[0]->n_initial_candidates = 1; log->prefetch_match_metrics_list[0]->n_initial_candidates_block_until_head = 1; log->prefetch_match_metrics_list[0]->prefetch_container_metrics = std::make_unique(); log->prefetch_match_metrics_list[0] ->prefetch_container_metrics->time_added_to_prefetch_service = Millis(10); log->prefetch_match_metrics_list[0] ->prefetch_container_metrics->time_initial_eligibility_got = Millis(20); log->prefetch_match_metrics_list[0] ->prefetch_container_metrics->time_prefetch_started = Millis(30); log->prefetch_match_metrics_list[0] ->prefetch_container_metrics->time_url_request_started = Millis(40); log->prefetch_match_metrics_list[0] ->prefetch_container_metrics->time_header_determined_successfully = Millis(500000); log->prefetch_match_metrics_list[0] ->prefetch_container_metrics->time_prefetch_completed_successfully = std::nullopt; log->prefetch_match_metrics_list[0] ->prefetch_potential_candidate_serving_result_last = PrefetchPotentialCandidateServingResult::kServed; log->prefetch_match_metrics_list[0] ->prefetch_potential_candidate_serving_result_ahead_of_prerender = std::nullopt; log->prefetch_match_metrics_list[0] ->prefetch_container_metrics_ahead_of_prerender = nullptr; log->prefetch_match_metrics_list[0]->prerender_debug_metrics = nullptr; log->is_prerender_aborted_by_prerender_url_loader_throttle = false; log->prerender_initial_preload_serving_metrics = nullptr; log->RecordMetricsForNonPrerenderNavigationCommitted(); log->RecordPreloadServingMetricsByNavigationInitiator( /*did_nav_use_bfcache=*/false, /*is_served_by_legacy_search_prefetch=*/false, "Other", /*is_url_srp=*/false); log->RecordFirstContentfulPaint(base::Milliseconds(334), /*is_in_foreground=*/true, /*is_served_by_legacy_search_prefetch=*/false, "Other", /*is_url_srp=*/false); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics.Count", 1, 1); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "IsPotentialMatch", 1, 1); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "PotentialMatchThen.NumberOfInitialCandidates", 1, 1); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "PotentialMatchThen.NumberOfInitialCandidatesBlockUntilHead", 1, 1); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "PotentialMatchThen.IsActualMatch", 1, 1); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "PrefetchMatchMetrics.PotentialMatchThen.PotentialCandidateServingResult." "Last", 0); histogram_tester.ExpectUniqueTimeSample( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "PotentialMatchThen.MatchDuration", Millis(57) - Millis(42), 1); histogram_tester.ExpectUniqueTimeSample( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "PotentialMatchThen.MatchDuration.ForActualMatch", Millis(57) - Millis(42), 1); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "PotentialMatchThen.MatchDuration.ForNotActualMatch", 0); histogram_tester.ExpectUniqueTimeSample( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "ActualMatchThen.TimeFromPrefetchContainerAddedToMatchStart", Millis(42) - Millis(10), 1); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "IsPotentialMatch.WithAheadOfPrerender", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "PotentialMatchThen.WithAheadOfPrerender.PotentialCandidateServingResult", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.Count", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.IsPotentialMatch", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.PotentialMatchThen.NumberOfInitialCandidates", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.PotentialMatchThen." "NumberOfInitialCandidatesBlockUntilHead", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.PotentialMatchThen.IsActualMatch", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.PotentialMatchThen.PotentialCandidateServingResult." "Last", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.PotentialMatchThen.MatchDuration", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.PotentialMatchThen.MatchDuration.ForActualMatch", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.PotentialMatchThen.MatchDuration.ForNotActualMatch", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.ActualMatchThen." "TimeFromPrefetchContainerAddedToMatchStart", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.IsPotentialMatch.WithAheadOfPrerender", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.PotentialMatchThen.WithAheadOfPrerender." "PotentialCandidateServingResult", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.Count", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.IsPotentialMatch", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.PotentialMatchThen.NumberOfInitialCandidates", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.PotentialMatchThen." "NumberOfInitialCandidatesBlockUntilHead", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.PotentialMatchThen.IsActualMatch", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.PotentialMatchThen.PotentialCandidateServingResult." "Last", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.PotentialMatchThen.MatchDuration", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.PotentialMatchThen.MatchDuration.ForActualMatch", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.PotentialMatchThen.MatchDuration.ForNotActualMatch", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.ActualMatchThen." "TimeFromPrefetchContainerAddedToMatchStart", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.IsPotentialMatch.WithAheadOfPrerender", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.PotentialMatchThen.WithAheadOfPrerender." "PotentialCandidateServingResult", 0); ExpectFCP(histogram_tester, "WithoutPreload", {}); ExpectFCP(histogram_tester, "WithPrefetch", {334}); ExpectFCP(histogram_tester, "WithPrefetch.WithPrePrefetch", {}); ExpectFCP(histogram_tester, "WithPrefetch.WithoutPrePrefetch", {334}); ExpectFCP(histogram_tester, "WithPrerender", {}); ExpectFCP(histogram_tester, "All.All.All", {334}); ExpectFCP(histogram_tester, "All.All.NoInstantLoad", {}); ExpectFCP(histogram_tester, "All.All.Prefetch", {334}); ExpectFCP(histogram_tester, "All.All.Prefetch.WithPrePrefetch", {}); ExpectFCP(histogram_tester, "All.All.Prefetch.WithoutPrePrefetch", {334}); ExpectFCP(histogram_tester, "All.All.Prerender", {}); ExpectFCP(histogram_tester, "Other.All.All", {334}); ExpectFCP(histogram_tester, "Other.All.NoInstantLoad", {}); ExpectFCP(histogram_tester, "Other.All.Prefetch", {334}); ExpectFCP(histogram_tester, "Other.All.Prefetch.WithPrePrefetch", {}); ExpectFCP(histogram_tester, "Other.All.Prefetch.WithoutPrePrefetch", {334}); ExpectFCP(histogram_tester, "Other.All.Prerender", {}); ExpectFCP(histogram_tester, "WithoutFiltering.All.All.All", {334}); ExpectFCP(histogram_tester, "WithoutFiltering.All.All.NoInstantLoad", {}); ExpectFCP(histogram_tester, "WithoutFiltering.All.All.Prefetch", {334}); ExpectFCP(histogram_tester, "WithoutFiltering.All.All.Prefetch.WithPrePrefetch", {}); ExpectFCP(histogram_tester, "WithoutFiltering.All.All.Prefetch.WithoutPrePrefetch", {334}); ExpectFCP(histogram_tester, "WithoutFiltering.All.All.Prerender", {}); ExpectFCP(histogram_tester, "WithoutFiltering.Other.All.All", {334}); ExpectFCP(histogram_tester, "WithoutFiltering.Other.All.NoInstantLoad", {}); ExpectFCP(histogram_tester, "WithoutFiltering.Other.All.Prefetch", {334}); ExpectFCP(histogram_tester, "WithoutFiltering.Other.All.Prefetch.WithPrePrefetch", {}); ExpectFCP(histogram_tester, "WithoutFiltering.Other.All.Prefetch.WithoutPrePrefetch", {334}); ExpectFCP(histogram_tester, "WithoutFiltering.Other.All.Prerender", {}); histogram_tester.ExpectUniqueSample("PreloadServingMetrics.Other.All", 1 /* kPrefetch */, 1); histogram_tester.ExpectTotalCount("PreloadServingMetrics.Other.SRP", 0); } TEST(PreloadServingMetricsTest, NavigationWithPrefetchWithPrePrefetch) { base::test::ScopedFeatureList feature_list; feature_list.InitWithFeaturesAndParameters( { { features::kPrerender2FallbackPrefetchSpecRules, {}, }, { features::kPrefetchOffTheMainThread, {}, }, }, {}); base::HistogramTester histogram_tester; auto log = MakeSkeletonPreloadServingMetrics({.n_prefetch_match_metrics = 1}); log->prefetch_match_metrics_list[0]->time_match_start = Millis(42); log->prefetch_match_metrics_list[0]->time_match_end = Millis(57); log->prefetch_match_metrics_list[0]->n_initial_candidates = 1; log->prefetch_match_metrics_list[0]->n_initial_candidates_block_until_head = 1; log->prefetch_match_metrics_list[0]->prefetch_container_metrics = std::make_unique(); log->prefetch_match_metrics_list[0] ->prefetch_container_metrics->time_added_to_prefetch_service = Millis(10); log->prefetch_match_metrics_list[0] ->prefetch_container_metrics->time_initial_eligibility_got = Millis(20); log->prefetch_match_metrics_list[0] ->prefetch_container_metrics->time_prefetch_started = Millis(30); log->prefetch_match_metrics_list[0] ->prefetch_container_metrics->time_url_request_started = Millis(40); log->prefetch_match_metrics_list[0] ->prefetch_container_metrics->time_header_determined_successfully = Millis(500000); log->prefetch_match_metrics_list[0] ->prefetch_container_metrics->time_prefetch_completed_successfully = std::nullopt; log->prefetch_match_metrics_list[0] ->prefetch_container_metrics->is_constructed_from_pre_prefetch = true; log->prefetch_match_metrics_list[0] ->prefetch_potential_candidate_serving_result_last = PrefetchPotentialCandidateServingResult::kServed; log->prefetch_match_metrics_list[0] ->prefetch_potential_candidate_serving_result_ahead_of_prerender = std::nullopt; log->prefetch_match_metrics_list[0] ->prefetch_container_metrics_ahead_of_prerender = nullptr; log->prefetch_match_metrics_list[0]->prerender_debug_metrics = nullptr; log->is_prerender_aborted_by_prerender_url_loader_throttle = false; log->prerender_initial_preload_serving_metrics = nullptr; log->RecordMetricsForNonPrerenderNavigationCommitted(); log->RecordPreloadServingMetricsByNavigationInitiator( /*did_nav_use_bfcache=*/false, /*is_served_by_legacy_search_prefetch=*/false, "Other", /*is_url_srp=*/false); log->RecordFirstContentfulPaint(base::Milliseconds(334), /*is_in_foreground=*/true, /*is_served_by_legacy_search_prefetch=*/false, "Other", /*is_url_srp=*/false); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics.Count", 1, 1); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "IsPotentialMatch", 1, 1); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "PotentialMatchThen.NumberOfInitialCandidates", 1, 1); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "PotentialMatchThen.NumberOfInitialCandidatesBlockUntilHead", 1, 1); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "PotentialMatchThen.IsActualMatch", 1, 1); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "PrefetchMatchMetrics.PotentialMatchThen.PotentialCandidateServingResult." "Last", 0); histogram_tester.ExpectUniqueTimeSample( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "PotentialMatchThen.MatchDuration", Millis(57) - Millis(42), 1); histogram_tester.ExpectUniqueTimeSample( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "PotentialMatchThen.MatchDuration.ForActualMatch", Millis(57) - Millis(42), 1); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "PotentialMatchThen.MatchDuration.ForNotActualMatch", 0); histogram_tester.ExpectUniqueTimeSample( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "ActualMatchThen.TimeFromPrefetchContainerAddedToMatchStart", Millis(42) - Millis(10), 1); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "IsPotentialMatch.WithAheadOfPrerender", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "PotentialMatchThen.WithAheadOfPrerender.PotentialCandidateServingResult", 0); ExpectFCP(histogram_tester, "WithoutPreload", {}); ExpectFCP(histogram_tester, "WithPrefetch", {334}); ExpectFCP(histogram_tester, "WithPrefetch.WithPrePrefetch", {334}); ExpectFCP(histogram_tester, "WithPrefetch.WithoutPrePrefetch", {}); ExpectFCP(histogram_tester, "WithPrerender", {}); ExpectFCP(histogram_tester, "All.All.All", {334}); ExpectFCP(histogram_tester, "All.All.NoInstantLoad", {}); ExpectFCP(histogram_tester, "All.All.Prefetch", {334}); ExpectFCP(histogram_tester, "All.All.Prefetch.WithPrePrefetch", {334}); ExpectFCP(histogram_tester, "All.All.Prefetch.WithoutPrePrefetch", {}); ExpectFCP(histogram_tester, "All.All.Prerender", {}); ExpectFCP(histogram_tester, "Other.All.All", {334}); ExpectFCP(histogram_tester, "Other.All.NoInstantLoad", {}); ExpectFCP(histogram_tester, "Other.All.Prefetch", {334}); ExpectFCP(histogram_tester, "Other.All.Prefetch.WithPrePrefetch", {334}); ExpectFCP(histogram_tester, "Other.All.Prefetch.WithoutPrePrefetch", {}); ExpectFCP(histogram_tester, "Other.All.Prerender", {}); ExpectFCP(histogram_tester, "WithoutFiltering.All.All.All", {334}); ExpectFCP(histogram_tester, "WithoutFiltering.All.All.NoInstantLoad", {}); ExpectFCP(histogram_tester, "WithoutFiltering.All.All.Prefetch", {334}); ExpectFCP(histogram_tester, "WithoutFiltering.All.All.Prefetch.WithPrePrefetch", {334}); ExpectFCP(histogram_tester, "WithoutFiltering.All.All.Prefetch.WithoutPrePrefetch", {}); ExpectFCP(histogram_tester, "WithoutFiltering.All.All.Prerender", {}); ExpectFCP(histogram_tester, "WithoutFiltering.Other.All.All", {334}); ExpectFCP(histogram_tester, "WithoutFiltering.Other.All.NoInstantLoad", {}); ExpectFCP(histogram_tester, "WithoutFiltering.Other.All.Prefetch", {334}); ExpectFCP(histogram_tester, "WithoutFiltering.Other.All.Prefetch.WithPrePrefetch", {334}); ExpectFCP(histogram_tester, "WithoutFiltering.Other.All.Prefetch.WithoutPrePrefetch", {}); ExpectFCP(histogram_tester, "WithoutFiltering.Other.All.Prerender", {}); histogram_tester.ExpectUniqueSample("PreloadServingMetrics.Other.All", 1 /* kPrefetch */, 1); histogram_tester.ExpectTotalCount("PreloadServingMetrics.Other.SRP", 0); } // Tests that PreloadServingMetrics.*.{All,SRP} are recorded depending on the // navigation initiator string. TEST(PreloadServingMetricsTest, RecordByNavigationInitiator) { base::HistogramTester histogram_tester; auto log = MakeSkeletonPreloadServingMetrics({.n_prefetch_match_metrics = 0}); log->is_prerender_aborted_by_prerender_url_loader_throttle = false; log->prerender_initial_preload_serving_metrics = nullptr; log->RecordPreloadServingMetricsByNavigationInitiator( /*did_nav_use_bfcache=*/false, /*is_served_by_legacy_search_prefetch=*/false, "TestInitiator", /*is_url_srp=*/true); log->RecordFirstContentfulPaint(base::Milliseconds(334), /*is_in_foreground=*/true, /*is_served_by_legacy_search_prefetch=*/false, "TestInitiator", /*is_url_srp=*/true); histogram_tester.ExpectUniqueSample("PreloadServingMetrics.TestInitiator.All", 0 /* kNoInstantLoad */, 1); histogram_tester.ExpectUniqueSample("PreloadServingMetrics.TestInitiator.SRP", 0 /* kNoInstantLoad */, 1); ExpectFCP(histogram_tester, "All.All.All", {334}); ExpectFCP(histogram_tester, "All.All.NoInstantLoad", {334}); ExpectFCP(histogram_tester, "All.SRP.All", {334}); ExpectFCP(histogram_tester, "All.SRP.NoInstantLoad", {334}); ExpectFCP(histogram_tester, "TestInitiator.All.All", {334}); ExpectFCP(histogram_tester, "TestInitiator.All.NoInstantLoad", {334}); ExpectFCP(histogram_tester, "TestInitiator.SRP.All", {334}); ExpectFCP(histogram_tester, "TestInitiator.SRP.NoInstantLoad", {334}); ExpectFCP(histogram_tester, "WithoutFiltering.All.All.All", {334}); ExpectFCP(histogram_tester, "WithoutFiltering.All.All.NoInstantLoad", {334}); ExpectFCP(histogram_tester, "WithoutFiltering.All.SRP.All", {334}); ExpectFCP(histogram_tester, "WithoutFiltering.All.SRP.NoInstantLoad", {334}); ExpectFCP(histogram_tester, "WithoutFiltering.TestInitiator.All.All", {334}); ExpectFCP(histogram_tester, "WithoutFiltering.TestInitiator.All.NoInstantLoad", {334}); ExpectFCP(histogram_tester, "WithoutFiltering.TestInitiator.SRP.All", {334}); ExpectFCP(histogram_tester, "WithoutFiltering.TestInitiator.SRP.NoInstantLoad", {334}); } // Scenario: // // - Prefetch A is triggered. // - Prerender B is triggered. // - B is blocked by A. // - Navigation C started. // - C is blocked by B. // - A succeeded. // - It unblocks B. // - B committed. // - C commmtted. TEST(PreloadServingMetricsTest, NavigationWithPrerenderWithPrefetchAheadOfPrerender) { base::test::ScopedFeatureList feature_list; feature_list.InitWithFeaturesAndParameters( { { features::kPrerender2FallbackPrefetchSpecRules, {}, }, }, {}); base::HistogramTester histogram_tester; auto log_prerender = MakeSkeletonPreloadServingMetrics({.n_prefetch_match_metrics = 1}); log_prerender->prefetch_match_metrics_list[0]->time_match_start = Millis(3042); log_prerender->prefetch_match_metrics_list[0]->time_match_end = Millis(3057); log_prerender->prefetch_match_metrics_list[0]->n_initial_candidates = 1; log_prerender->prefetch_match_metrics_list[0] ->n_initial_candidates_block_until_head = 1; log_prerender->prefetch_match_metrics_list[0]->prefetch_container_metrics = std::make_unique(); log_prerender->prefetch_match_metrics_list[0] ->prefetch_container_metrics->time_added_to_prefetch_service = Millis(10); log_prerender->prefetch_match_metrics_list[0] ->prefetch_container_metrics->time_initial_eligibility_got = Millis(200); log_prerender->prefetch_match_metrics_list[0] ->prefetch_container_metrics->time_prefetch_started = Millis(3000); log_prerender->prefetch_match_metrics_list[0] ->prefetch_container_metrics->time_url_request_started = Millis(40000); log_prerender->prefetch_match_metrics_list[0] ->prefetch_container_metrics->time_header_determined_successfully = Millis(500000); log_prerender->prefetch_match_metrics_list[0] ->prefetch_container_metrics->time_prefetch_completed_successfully = std::nullopt; log_prerender->prefetch_match_metrics_list[0] ->prefetch_potential_candidate_serving_result_last = PrefetchPotentialCandidateServingResult::kServed; log_prerender->prefetch_match_metrics_list[0] ->prefetch_potential_candidate_serving_result_ahead_of_prerender = std::nullopt; log_prerender->prefetch_match_metrics_list[0] ->prefetch_container_metrics_ahead_of_prerender = nullptr; // Actually, this case should have non null // `prerender_debug_metrics`, but we omit it as we // don't check the UMAs in test. log_prerender->prefetch_match_metrics_list[0]->prerender_debug_metrics = nullptr; log_prerender->is_prerender_aborted_by_prerender_url_loader_throttle = false; log_prerender->prerender_initial_preload_serving_metrics = nullptr; auto log = MakeSkeletonPreloadServingMetrics({.n_prefetch_match_metrics = 0}); log->is_prerender_aborted_by_prerender_url_loader_throttle = false; log->prerender_initial_preload_serving_metrics = std::move(log_prerender); log->RecordMetricsForNonPrerenderNavigationCommitted(); log->RecordPreloadServingMetricsByNavigationInitiator( /*did_nav_use_bfcache=*/false, /*is_served_by_legacy_search_prefetch=*/false, "Other", /*is_url_srp=*/false); log->RecordFirstContentfulPaint(base::Milliseconds(334), /*is_in_foreground=*/true, /*is_served_by_legacy_search_prefetch=*/false, "Other", /*is_url_srp=*/false); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics.Count", 0, 1); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "IsPotentialMatch", false, 1); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "PotentialMatchThen.NumberOfInitialCandidates", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "PotentialMatchThen.NumberOfInitialCandidatesBlockUntilHead", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForNavigationCommitted.PreloadServingMetrics." "ForNavigationCommitted.PrefetchMatchMetrics.PotentialMatchThen." "IsActualMatch", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForNavigationCommitted.PreloadServingMetrics." "PrefetchMatchMetrics.PotentialMatchThen.PotentialCandidateServingResult." "Last", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "PotentialMatchThen.MatchDuration", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "PotentialMatchThen.MatchDuration.ForActualMatch", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "PotentialMatchThen.MatchDuration.ForNotActualMatch", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "ActualMatchThen.TimeFromPrefetchContainerAddedToMatchStart", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "IsPotentialMatch.WithAheadOfPrerender", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "PotentialMatchThen.WithAheadOfPrerender.PotentialCandidateServingResult", 0); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.Count", 1, 1); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.IsPotentialMatch", true, 1); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.PotentialMatchThen.NumberOfInitialCandidates", 1, 1); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.PotentialMatchThen." "NumberOfInitialCandidatesBlockUntilHead", 1, 1); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.PotentialMatchThen.IsActualMatch", 1, 1); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.PotentialMatchThen.PotentialCandidateServingResult." "Last", PrefetchPotentialCandidateServingResult::kServed, 1); histogram_tester.ExpectUniqueTimeSample( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.PotentialMatchThen.MatchDuration", Millis(3057) - Millis(3042), 1); histogram_tester.ExpectUniqueTimeSample( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.PotentialMatchThen.MatchDuration.ForActualMatch", Millis(3057) - Millis(3042), 1); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.PotentialMatchThen.MatchDuration.ForNotActualMatch", 0); histogram_tester.ExpectUniqueTimeSample( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.ActualMatchThen." "TimeFromPrefetchContainerAddedToMatchStart", Millis(3042) - Millis(10), 1); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.IsPotentialMatch.WithAheadOfPrerender", false, 1); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.PotentialMatchThen.WithAheadOfPrerender." "PotentialCandidateServingResult", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.Count", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.IsPotentialMatch", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.PotentialMatchThen.NumberOfInitialCandidates", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.PotentialMatchThen." "NumberOfInitialCandidatesBlockUntilHead", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.PotentialMatchThen.IsActualMatch", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.PotentialMatchThen.PotentialCandidateServingResult." "Last", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.PotentialMatchThen.MatchDuration", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.PotentialMatchThen.MatchDuration.ForActualMatch", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.PotentialMatchThen.MatchDuration.ForNotActualMatch", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.ActualMatchThen." "TimeFromPrefetchContainerAddedToMatchStart", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.IsPotentialMatch.WithAheadOfPrerender", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.PotentialMatchThen.WithAheadOfPrerender." "PotentialCandidateServingResult", 0); ExpectFCP(histogram_tester, "WithoutPreload", {}); ExpectFCP(histogram_tester, "WithPrefetch", {}); ExpectFCP(histogram_tester, "WithPrerender", {334}); ExpectFCP(histogram_tester, "All.All.All", {334}); ExpectFCP(histogram_tester, "All.All.NoInstantLoad", {}); ExpectFCP(histogram_tester, "All.All.Prefetch", {}); ExpectFCP(histogram_tester, "All.All.Prerender", {334}); ExpectFCP(histogram_tester, "Other.All.All", {334}); ExpectFCP(histogram_tester, "Other.All.NoInstantLoad", {}); ExpectFCP(histogram_tester, "Other.All.Prefetch", {}); ExpectFCP(histogram_tester, "Other.All.Prerender", {334}); ExpectFCP(histogram_tester, "WithoutFiltering.All.All.All", {334}); ExpectFCP(histogram_tester, "WithoutFiltering.All.All.NoInstantLoad", {}); ExpectFCP(histogram_tester, "WithoutFiltering.All.All.Prefetch", {}); ExpectFCP(histogram_tester, "WithoutFiltering.All.All.Prerender", {334}); ExpectFCP(histogram_tester, "WithoutFiltering.Other.All.All", {334}); ExpectFCP(histogram_tester, "WithoutFiltering.Other.All.NoInstantLoad", {}); ExpectFCP(histogram_tester, "WithoutFiltering.Other.All.Prefetch", {}); ExpectFCP(histogram_tester, "WithoutFiltering.Other.All.Prerender", {334}); histogram_tester.ExpectUniqueSample("PreloadServingMetrics.Other.All", 2 /* kPrerender */, 1); histogram_tester.ExpectTotalCount("PreloadServingMetrics.Other.SRP", 0); } // Scenario: // // - Prefetch A is triggered. // - Prerender B is triggered. // - B is blocked by A. // - Navigation C started. // - C is blocked by B. // - A failed. (Timeout of `PrefetchStreamingURLLoader`) // - It unblocks B. // - B failed due to the prefetch failure. // - C passes prefech matching, not blocked by A as it has been failed. // - C falls back to network. TEST(PreloadServingMetricsTest, PrefetchTriggeredPrerenderTriggeredNavigationStartedPrefetchFailed) { base::test::ScopedFeatureList feature_list; feature_list.InitWithFeaturesAndParameters( { { features::kPrerender2FallbackPrefetchSpecRules, { }, }, }, {}); base::HistogramTester histogram_tester; auto log_prerender = MakeSkeletonPreloadServingMetrics({.n_prefetch_match_metrics = 1}); log_prerender->prefetch_match_metrics_list[0]->time_match_start = Millis(42); log_prerender->prefetch_match_metrics_list[0]->time_match_end = Millis(1057); log_prerender->prefetch_match_metrics_list[0]->n_initial_candidates = 1; log_prerender->prefetch_match_metrics_list[0] ->n_initial_candidates_block_until_head = 1; log_prerender->prefetch_match_metrics_list[0]->prefetch_container_metrics = nullptr; log_prerender->prefetch_match_metrics_list[0] ->prefetch_potential_candidate_serving_result_last = PrefetchPotentialCandidateServingResult::kNotServedLoadFailed; log_prerender->prefetch_match_metrics_list[0] ->prefetch_potential_candidate_serving_result_ahead_of_prerender = PrefetchPotentialCandidateServingResult::kNotServedLoadFailed; log_prerender->prefetch_match_metrics_list[0] ->prefetch_container_metrics_ahead_of_prerender = std::make_unique(); log_prerender->prefetch_match_metrics_list[0] ->prefetch_container_metrics_ahead_of_prerender ->time_added_to_prefetch_service = Millis(10); log_prerender->prefetch_match_metrics_list[0] ->prefetch_container_metrics_ahead_of_prerender ->time_initial_eligibility_got = Millis(20); log_prerender->prefetch_match_metrics_list[0] ->prefetch_container_metrics_ahead_of_prerender->time_prefetch_started = Millis(300); log_prerender->prefetch_match_metrics_list[0] ->prefetch_container_metrics_ahead_of_prerender ->time_url_request_started = Millis(400); log_prerender->prefetch_match_metrics_list[0] ->prefetch_container_metrics_ahead_of_prerender ->time_header_determined_successfully = std::nullopt; log_prerender->prefetch_match_metrics_list[0] ->prefetch_container_metrics_ahead_of_prerender ->time_prefetch_completed_successfully = std::nullopt; // Actually, this case should have non null // `prerender_debug_metrics`, but we omit it as we // don't check the UMAs in test. log_prerender->prefetch_match_metrics_list[0]->prerender_debug_metrics = nullptr; log_prerender->is_prerender_aborted_by_prerender_url_loader_throttle = true; log_prerender->prerender_initial_preload_serving_metrics = nullptr; auto log = MakeSkeletonPreloadServingMetrics({.n_prefetch_match_metrics = 1}); log->prefetch_match_metrics_list[0]->time_match_start = Millis(1157); log->prefetch_match_metrics_list[0]->time_match_end = Millis(1157); log->prefetch_match_metrics_list[0]->n_initial_candidates = 0; log->prefetch_match_metrics_list[0]->n_initial_candidates_block_until_head = 0; log->prefetch_match_metrics_list[0]->prefetch_container_metrics = nullptr; log->prefetch_match_metrics_list[0] ->prefetch_potential_candidate_serving_result_last = PrefetchPotentialCandidateServingResult::kNotServedLoadFailed; log->prefetch_match_metrics_list[0] ->prefetch_potential_candidate_serving_result_ahead_of_prerender = std::nullopt; log->prefetch_match_metrics_list[0] ->prefetch_container_metrics_ahead_of_prerender = nullptr; log->prefetch_match_metrics_list[0]->prerender_debug_metrics = nullptr; log->is_prerender_aborted_by_prerender_url_loader_throttle = false; log->prerender_initial_preload_serving_metrics = nullptr; log_prerender->RecordMetricsForPrerenderInitialNavigationFailed(); log->RecordMetricsForNonPrerenderNavigationCommitted(); log->RecordPreloadServingMetricsByNavigationInitiator( /*did_nav_use_bfcache=*/false, /*is_served_by_legacy_search_prefetch=*/false, "Other", /*is_url_srp=*/false); log->RecordFirstContentfulPaint(base::Milliseconds(2157), /*is_in_foreground=*/true, /*is_served_by_legacy_search_prefetch=*/false, "Other", /*is_url_srp=*/false); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics.Count", 1, 1); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "IsPotentialMatch", false, 1); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "PotentialMatchThen.NumberOfInitialCandidates", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "PotentialMatchThen.NumberOfInitialCandidatesBlockUntilHead", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForNavigationCommitted.PreloadServingMetrics." "ForNavigationCommitted.PrefetchMatchMetrics.PotentialMatchThen." "IsActualMatch", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForNavigationCommitted.PreloadServingMetrics." "PrefetchMatchMetrics.PotentialMatchThen.PotentialCandidateServingResult." "Last", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "PotentialMatchThen.MatchDuration", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "PotentialMatchThen.MatchDuration.ForActualMatch", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "PotentialMatchThen.MatchDuration.ForNotActualMatch", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "ActualMatchThen.TimeFromPrefetchContainerAddedToMatchStart", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "IsPotentialMatch.WithAheadOfPrerender", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "PotentialMatchThen.WithAheadOfPrerender.PotentialCandidateServingResult", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.Count", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.IsPotentialMatch", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.PotentialMatchThen.NumberOfInitialCandidates", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.PotentialMatchThen." "NumberOfInitialCandidatesBlockUntilHead", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.PotentialMatchThen.IsActualMatch", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.PotentialMatchThen.PotentialCandidateServingResult." "Last", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.PotentialMatchThen.MatchDuration", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.PotentialMatchThen.MatchDuration.ForActualMatch", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.PotentialMatchThen.MatchDuration.ForNotActualMatch", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.ActualMatchThen." "TimeFromPrefetchContainerAddedToMatchStart", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.IsPotentialMatch.WithAheadOfPrerender", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.PotentialMatchThen.WithAheadOfPrerender." "PotentialCandidateServingResult", 0); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.Count", 1, 1); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.IsPotentialMatch", true, 1); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.PotentialMatchThen.NumberOfInitialCandidates", 1, 1); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.PotentialMatchThen." "NumberOfInitialCandidatesBlockUntilHead", 1, 1); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.PotentialMatchThen.IsActualMatch", false, 1); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.PotentialMatchThen.PotentialCandidateServingResult." "Last", PrefetchPotentialCandidateServingResult::kNotServedLoadFailed, 1); histogram_tester.ExpectUniqueTimeSample( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.PotentialMatchThen.MatchDuration", Millis(1057) - Millis(42), 1); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.PotentialMatchThen.MatchDuration.ForActualMatch", 0); histogram_tester.ExpectUniqueTimeSample( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.PotentialMatchThen.MatchDuration.ForNotActualMatch", Millis(1057) - Millis(42), 1); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.ActualMatchThen." "TimeFromPrefetchContainerAddedToMatchStart", 0); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.IsPotentialMatch.WithAheadOfPrerender", true, 1); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.PotentialMatchThen.WithAheadOfPrerender." "PotentialCandidateServingResult", PrefetchPotentialCandidateServingResult::kNotServedLoadFailed, 1); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "WithMatchDurationGe10000.PrefetchMatchMetrics.Count", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "WithMatchDurationGe10000.PrefetchMatchMetrics.IsPotentialMatch", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "WithMatchDurationGe10000.PrefetchMatchMetrics.PotentialMatchThen." "NumberOfInitialCandidates", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "WithMatchDurationGe10000.PrefetchMatchMetrics.PotentialMatchThen." "NumberOfInitialCandidatesBlockUntilHead", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "WithMatchDurationGe10000.PrefetchMatchMetrics.PotentialMatchThen." "IsActualMatch", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "WithMatchDurationGe10000.PrefetchMatchMetrics.PotentialMatchThen." "PotentialCandidateServingResult.Last", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "WithMatchDurationGe10000.PrefetchMatchMetrics.PotentialMatchThen." "MatchDuration", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "WithMatchDurationGe10000.PrefetchMatchMetrics.PotentialMatchThen." "MatchDuration.ForActualMatch", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "WithMatchDurationGe10000.PrefetchMatchMetrics.PotentialMatchThen." "MatchDuration.ForNotActualMatch", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "WithMatchDurationGe10000.PrefetchMatchMetrics.ActualMatchThen." "TimeFromPrefetchContainerAddedToMatchStart", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "WithMatchDurationGe10000.PrefetchMatchMetrics.IsPotentialMatch." "WithAheadOfPrerender", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "WithMatchDurationGe10000.PrefetchMatchMetrics.PotentialMatchThen." "WithAheadOfPrerender.PotentialCandidateServingResult", 0); ExpectFCP(histogram_tester, "WithoutPreload", {2157}); ExpectFCP(histogram_tester, "WithPrefetch", {}); ExpectFCP(histogram_tester, "WithPrerender", {}); ExpectFCP(histogram_tester, "All.All.All", {2157}); ExpectFCP(histogram_tester, "All.All.NoInstantLoad", {2157}); ExpectFCP(histogram_tester, "All.All.Prefetch", {}); ExpectFCP(histogram_tester, "All.All.Prerender", {}); ExpectFCP(histogram_tester, "Other.All.All", {2157}); ExpectFCP(histogram_tester, "Other.All.NoInstantLoad", {2157}); ExpectFCP(histogram_tester, "Other.All.Prefetch", {}); ExpectFCP(histogram_tester, "Other.All.Prerender", {}); ExpectFCP(histogram_tester, "WithoutFiltering.All.All.All", {2157}); ExpectFCP(histogram_tester, "WithoutFiltering.All.All.NoInstantLoad", {2157}); ExpectFCP(histogram_tester, "WithoutFiltering.All.All.Prefetch", {}); ExpectFCP(histogram_tester, "WithoutFiltering.All.All.Prerender", {}); ExpectFCP(histogram_tester, "WithoutFiltering.Other.All.All", {2157}); ExpectFCP(histogram_tester, "WithoutFiltering.Other.All.NoInstantLoad", {2157}); ExpectFCP(histogram_tester, "WithoutFiltering.Other.All.Prefetch", {}); ExpectFCP(histogram_tester, "WithoutFiltering.Other.All.Prerender", {}); histogram_tester.ExpectUniqueSample("PreloadServingMetrics.Other.All", 0 /* kNoInstantLoad */, 1); histogram_tester.ExpectTotalCount("PreloadServingMetrics.Other.SRP", 0); } // Variant of PrefetchTriggeredPrerenderTriggeredNavigationStartedPrefetchFailed // // Prefetch matching took greater than or equal to 10000ms. TEST( PreloadServingMetricsTest, PrefetchTriggeredPrerenderTriggeredNavigationStartedPrefetchFailedDurationGe10000) { base::test::ScopedFeatureList feature_list; feature_list.InitWithFeaturesAndParameters( { { features::kPrerender2FallbackPrefetchSpecRules, { }, }, }, {}); base::HistogramTester histogram_tester; auto log_prerender = MakeSkeletonPreloadServingMetrics({.n_prefetch_match_metrics = 1}); log_prerender->prefetch_match_metrics_list[0]->time_match_start = Millis(42); log_prerender->prefetch_match_metrics_list[0]->time_match_end = Millis(10057); log_prerender->prefetch_match_metrics_list[0]->n_initial_candidates = 1; log_prerender->prefetch_match_metrics_list[0] ->n_initial_candidates_block_until_head = 1; log_prerender->prefetch_match_metrics_list[0]->prefetch_container_metrics = nullptr; log_prerender->prefetch_match_metrics_list[0] ->prefetch_potential_candidate_serving_result_last = PrefetchPotentialCandidateServingResult::kNotServedLoadFailed; log_prerender->prefetch_match_metrics_list[0] ->prefetch_potential_candidate_serving_result_ahead_of_prerender = PrefetchPotentialCandidateServingResult::kNotServedLoadFailed; log_prerender->prefetch_match_metrics_list[0] ->prefetch_container_metrics_ahead_of_prerender = std::make_unique(); log_prerender->prefetch_match_metrics_list[0] ->prefetch_container_metrics_ahead_of_prerender ->time_added_to_prefetch_service = Millis(10); log_prerender->prefetch_match_metrics_list[0] ->prefetch_container_metrics_ahead_of_prerender ->time_initial_eligibility_got = Millis(200); log_prerender->prefetch_match_metrics_list[0] ->prefetch_container_metrics_ahead_of_prerender->time_prefetch_started = Millis(3000); log_prerender->prefetch_match_metrics_list[0] ->prefetch_container_metrics_ahead_of_prerender ->time_url_request_started = Millis(40000); log_prerender->prefetch_match_metrics_list[0] ->prefetch_container_metrics_ahead_of_prerender ->time_header_determined_successfully = std::nullopt; log_prerender->prefetch_match_metrics_list[0] ->prefetch_container_metrics_ahead_of_prerender ->time_prefetch_completed_successfully = std::nullopt; // Actually, this case should have non null // `prerender_debug_metrics`, but we omit it as we // don't check the UMAs in test. log_prerender->prefetch_match_metrics_list[0]->prerender_debug_metrics = nullptr; log_prerender->is_prerender_aborted_by_prerender_url_loader_throttle = true; log_prerender->prerender_initial_preload_serving_metrics = nullptr; auto log = MakeSkeletonPreloadServingMetrics({.n_prefetch_match_metrics = 1}); log->prefetch_match_metrics_list[0]->time_match_start = Millis(10157); log->prefetch_match_metrics_list[0]->time_match_end = Millis(10157); log->prefetch_match_metrics_list[0]->n_initial_candidates = 0; log->prefetch_match_metrics_list[0]->n_initial_candidates_block_until_head = 0; log->prefetch_match_metrics_list[0]->prefetch_container_metrics = nullptr; log->prefetch_match_metrics_list[0] ->prefetch_potential_candidate_serving_result_last = std::nullopt; log->prefetch_match_metrics_list[0] ->prefetch_potential_candidate_serving_result_ahead_of_prerender = std::nullopt; log->prefetch_match_metrics_list[0] ->prefetch_container_metrics_ahead_of_prerender = nullptr; log->prefetch_match_metrics_list[0]->prerender_debug_metrics = nullptr; log->is_prerender_aborted_by_prerender_url_loader_throttle = false; log->prerender_initial_preload_serving_metrics = nullptr; log_prerender->RecordMetricsForPrerenderInitialNavigationFailed(); log->RecordMetricsForNonPrerenderNavigationCommitted(); log->RecordPreloadServingMetricsByNavigationInitiator( /*did_nav_use_bfcache=*/false, /*is_served_by_legacy_search_prefetch=*/false, "Other", /*is_url_srp=*/false); log->RecordFirstContentfulPaint(base::Milliseconds(10334), /*is_in_foreground=*/true, /*is_served_by_legacy_search_prefetch=*/false, "Other", /*is_url_srp=*/false); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics.Count", 1, 1); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "IsPotentialMatch", false, 1); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "PotentialMatchThen.NumberOfInitialCandidates", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "PotentialMatchThen.NumberOfInitialCandidatesBlockUntilHead", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForNavigationCommitted.PreloadServingMetrics." "ForNavigationCommitted.PrefetchMatchMetrics.PotentialMatchThen." "IsActualMatch", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "PotentialMatchThen.PotentialCandidateServingResult.Last", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "PotentialMatchThen.MatchDuration", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "PotentialMatchThen.MatchDuration.ForActualMatch", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "PotentialMatchThen.MatchDuration.ForNotActualMatch", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "ActualMatchThen.TimeFromPrefetchContainerAddedToMatchStart", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "IsPotentialMatch.WithAheadOfPrerender", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForNavigationCommitted.PrefetchMatchMetrics." "PotentialMatchThen.WithAheadOfPrerender.PotentialCandidateServingResult", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.Count", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.IsPotentialMatch", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.PotentialMatchThen.NumberOfInitialCandidates", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.PotentialMatchThen." "NumberOfInitialCandidatesBlockUntilHead", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.PotentialMatchThen.IsActualMatch", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.PotentialMatchThen.PotentialCandidateServingResult." "Last", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.PotentialMatchThen.MatchDuration", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.PotentialMatchThen.MatchDuration.ForActualMatch", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.PotentialMatchThen.MatchDuration.ForNotActualMatch", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.ActualMatchThen." "TimeFromPrefetchContainerAddedToMatchStart", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.IsPotentialMatch.WithAheadOfPrerender", 0); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationUsed." "PrefetchMatchMetrics.PotentialMatchThen.WithAheadOfPrerender." "PotentialCandidateServingResult", 0); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.Count", 1, 1); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.IsPotentialMatch", true, 1); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.PotentialMatchThen.NumberOfInitialCandidates", 1, 1); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.PotentialMatchThen." "NumberOfInitialCandidatesBlockUntilHead", 1, 1); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.PotentialMatchThen.IsActualMatch", false, 1); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.PotentialMatchThen.PotentialCandidateServingResult." "Last", PrefetchPotentialCandidateServingResult::kNotServedLoadFailed, 1); histogram_tester.ExpectUniqueTimeSample( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.PotentialMatchThen.MatchDuration", Millis(10057) - Millis(42), 1); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.PotentialMatchThen.MatchDuration.ForActualMatch", 0); histogram_tester.ExpectUniqueTimeSample( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.PotentialMatchThen.MatchDuration.ForNotActualMatch", Millis(10057) - Millis(42), 1); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.ActualMatchThen." "TimeFromPrefetchContainerAddedToMatchStart", 0); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.IsPotentialMatch.WithAheadOfPrerender", true, 1); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "PrefetchMatchMetrics.PotentialMatchThen.WithAheadOfPrerender." "PotentialCandidateServingResult", PrefetchPotentialCandidateServingResult::kNotServedLoadFailed, 1); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "WithMatchDurationGe10000.PrefetchMatchMetrics.Count", 1, 1); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "WithMatchDurationGe10000.PrefetchMatchMetrics.IsPotentialMatch", true, 1); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "WithMatchDurationGe10000.PrefetchMatchMetrics.PotentialMatchThen." "NumberOfInitialCandidates", 1, 1); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "WithMatchDurationGe10000.PrefetchMatchMetrics.PotentialMatchThen." "NumberOfInitialCandidatesBlockUntilHead", 1, 1); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "WithMatchDurationGe10000.PrefetchMatchMetrics.PotentialMatchThen." "IsActualMatch", false, 1); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "WithMatchDurationGe10000.PrefetchMatchMetrics.PotentialMatchThen." "PotentialCandidateServingResult.Last", PrefetchPotentialCandidateServingResult::kNotServedLoadFailed, 1); histogram_tester.ExpectUniqueTimeSample( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "WithMatchDurationGe10000.PrefetchMatchMetrics.PotentialMatchThen." "MatchDuration", Millis(10057) - Millis(42), 1); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "WithMatchDurationGe10000.PrefetchMatchMetrics.PotentialMatchThen." "MatchDuration.ForActualMatch", 0); histogram_tester.ExpectUniqueTimeSample( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "WithMatchDurationGe10000.PrefetchMatchMetrics.PotentialMatchThen." "MatchDuration.ForNotActualMatch", Millis(10057) - Millis(42), 1); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "WithMatchDurationGe10000.PrefetchMatchMetrics.ActualMatchThen." "TimeFromPrefetchContainerAddedToMatchStart", 0); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "WithMatchDurationGe10000.PrefetchMatchMetrics.IsPotentialMatch." "WithAheadOfPrerender", true, 1); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "WithMatchDurationGe10000.PrefetchMatchMetrics.PotentialMatchThen." "WithAheadOfPrerender.PotentialCandidateServingResult", PrefetchPotentialCandidateServingResult::kNotServedLoadFailed, 1); ExpectFCP(histogram_tester, "WithoutPreload", {10334}); ExpectFCP(histogram_tester, "WithPrefetch", {}); ExpectFCP(histogram_tester, "WithPrerender", {}); ExpectFCP(histogram_tester, "All.All.All", {10334}); ExpectFCP(histogram_tester, "All.All.NoInstantLoad", {10334}); ExpectFCP(histogram_tester, "All.All.Prefetch", {}); ExpectFCP(histogram_tester, "All.All.Prerender", {}); ExpectFCP(histogram_tester, "Other.All.All", {10334}); ExpectFCP(histogram_tester, "Other.All.NoInstantLoad", {10334}); ExpectFCP(histogram_tester, "Other.All.Prefetch", {}); ExpectFCP(histogram_tester, "Other.All.Prerender", {}); ExpectFCP(histogram_tester, "WithoutFiltering.All.All.All", {10334}); ExpectFCP(histogram_tester, "WithoutFiltering.All.All.NoInstantLoad", {10334}); ExpectFCP(histogram_tester, "WithoutFiltering.All.All.Prefetch", {}); ExpectFCP(histogram_tester, "WithoutFiltering.All.All.Prerender", {}); ExpectFCP(histogram_tester, "WithoutFiltering.Other.All.All", {10334}); ExpectFCP(histogram_tester, "WithoutFiltering.Other.All.NoInstantLoad", {10334}); ExpectFCP(histogram_tester, "WithoutFiltering.Other.All.Prefetch", {}); ExpectFCP(histogram_tester, "WithoutFiltering.Other.All.Prerender", {}); histogram_tester.ExpectUniqueSample("PreloadServingMetrics.Other.All", 0 /* kNoInstantLoad */, 1); histogram_tester.ExpectTotalCount("PreloadServingMetrics.Other.SRP", 0); } // Check for `PrefetchMatchPrerenderDebugMetrics` // // Scenario: // // - Prefetch A is triggered. // - Prerender B is triggered. // - But B is not blocked by prefech matching as A is not // `OnPrefetchStarted()`. (We don't expect this case occurs if // `UsePrefetchPrerenderIntegration()`.) // - B is cancelled by `PrerenderURLLoaderThrottle`. // - Navigation C started. // - C falls back to network. TEST(PreloadServingMetricsTest, PrefetchMatchPrerenderDebugMetrics) { base::test::ScopedFeatureList feature_list; feature_list.InitWithFeaturesAndParameters( { { features::kPrerender2FallbackPrefetchSpecRules, { }, }, }, {}); base::HistogramTester histogram_tester; auto log_prerender = MakeSkeletonPreloadServingMetrics({.n_prefetch_match_metrics = 1}); log_prerender->prefetch_match_metrics_list[0]->time_match_start = Millis(42); log_prerender->prefetch_match_metrics_list[0]->time_match_end = Millis(43); log_prerender->prefetch_match_metrics_list[0]->n_initial_candidates = 0; log_prerender->prefetch_match_metrics_list[0] ->n_initial_candidates_block_until_head = 0; log_prerender->prefetch_match_metrics_list[0]->prefetch_container_metrics = nullptr; log_prerender->prefetch_match_metrics_list[0] ->prefetch_potential_candidate_serving_result_last = std::nullopt; log_prerender->prefetch_match_metrics_list[0] ->prefetch_potential_candidate_serving_result_ahead_of_prerender = std::nullopt; // `prefetch_container_metrics_ahead_of_prerender` is null as it is not // `PrefetchMatchResolver::RegisterCandidate()`ed. log_prerender->prefetch_match_metrics_list[0] ->prefetch_container_metrics_ahead_of_prerender = nullptr; log_prerender->prerender_initial_preload_serving_metrics = nullptr; log_prerender->prefetch_match_metrics_list[0]->prerender_debug_metrics = std::make_unique(); log_prerender->prefetch_match_metrics_list[0] ->prerender_debug_metrics->prefetch_ahead_of_prerender_debug_metrics = std::make_unique(); log_prerender->prefetch_match_metrics_list[0] ->prerender_debug_metrics->prefetch_ahead_of_prerender_debug_metrics ->prefetch_status = PrefetchStatus::kPrefetchNotStarted; log_prerender->prefetch_match_metrics_list[0] ->prerender_debug_metrics->prefetch_ahead_of_prerender_debug_metrics ->servable_state = PrefetchServableState::kNotServable; log_prerender->prefetch_match_metrics_list[0] ->prerender_debug_metrics->prefetch_ahead_of_prerender_debug_metrics ->match_resolver_action = PrefetchMatchResolverAction( PrefetchMatchResolverAction::ActionKind::kDrop, PrefetchContainer::LoadState::kEligible, /*is_expired=*/std::nullopt); log_prerender->prefetch_match_metrics_list[0] ->prerender_debug_metrics->prefetch_ahead_of_prerender_debug_metrics ->queue_size = 5; log_prerender->prefetch_match_metrics_list[0] ->prerender_debug_metrics->prefetch_ahead_of_prerender_debug_metrics ->queue_index = 3; log_prerender->prefetch_match_metrics_list[0] ->prerender_debug_metrics->prefetch_ahead_of_prerender_debug_metrics ->collect_result = PrefetchPotentialCandidateCollectResult::kAvailable; log_prerender->is_prerender_aborted_by_prerender_url_loader_throttle = true; auto log = MakeSkeletonPreloadServingMetrics({.n_prefetch_match_metrics = 1}); log->prefetch_match_metrics_list[0]->time_match_start = Millis(10157); log->prefetch_match_metrics_list[0]->time_match_end = Millis(10157); log->prefetch_match_metrics_list[0]->n_initial_candidates = 0; log->prefetch_match_metrics_list[0]->n_initial_candidates_block_until_head = 0; log->prefetch_match_metrics_list[0]->prefetch_container_metrics = nullptr; log->prefetch_match_metrics_list[0] ->prefetch_potential_candidate_serving_result_last = std::nullopt; log->prefetch_match_metrics_list[0] ->prefetch_potential_candidate_serving_result_ahead_of_prerender = std::nullopt; log->prefetch_match_metrics_list[0] ->prefetch_container_metrics_ahead_of_prerender = nullptr; log->prefetch_match_metrics_list[0]->prerender_debug_metrics = nullptr; log->is_prerender_aborted_by_prerender_url_loader_throttle = false; log->prefetch_match_metrics_list[0]->prerender_debug_metrics = nullptr; log->is_prerender_aborted_by_prerender_url_loader_throttle = false; log->prerender_initial_preload_serving_metrics = nullptr; log_prerender->RecordMetricsForPrerenderInitialNavigationFailed(); log->RecordMetricsForNonPrerenderNavigationCommitted(); log->RecordPreloadServingMetricsByNavigationInitiator( /*did_nav_use_bfcache=*/false, /*is_served_by_legacy_search_prefetch=*/false, "Other", /*is_url_srp=*/false); log->RecordFirstContentfulPaint(base::Milliseconds(10334), /*is_in_foreground=*/true, /*is_served_by_legacy_search_prefetch=*/false, "Other", /*is_url_srp=*/false); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "FallbackAborted.Match0.PrefetchMatchMetrics.Count", 1, 1); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "FallbackAborted.Match0.PrefetchMatchMetrics.IsPotentialMatch", false, 1); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "FallbackAborted.Match0.PrefetchMatchMetrics.ExistsPaop", true, 1); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "FallbackAborted.Match0.PrefetchMatchMetrics.ExistsPaopThen." "PrefetchStatus", PrefetchStatus::kPrefetchNotStarted, 1); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "FallbackAborted.Match0.PrefetchMatchMetrics.ExistsPaopThen." "ServableStateAndMatcherAction", // 4 = PrefetchServableState::kNotServable // 1 = PrefetchMatchResolverAction::ActionKind::kDrop // 2 = PrefetchContainer::LoadState::kEligible // 1 = is_expired == false 4121, 1); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "FallbackAborted.Match0.PrefetchMatchMetrics.ExistsPaopThen." "PotentialCandidateCollectResultAndServableStateAndMatcherAction", // 1 = PrefetchPotentialCandidateCollectResult::kAvailable // 4 = PrefetchServableState::kNotServable // 1 = PrefetchMatchResolverAction::ActionKind::kDrop // 2 = PrefetchContainer::LoadState::kEligible // 1 = is_expired == false 14121, 1); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "FallbackAborted.Match0.PrefetchMatchMetrics.ExistsPaopThen." "PotentialCandidateServingResultAndServableStateAndMatcherAction", // 14 = PrefetchPotentialCandidateServingResult::kNotServedNoCandidates // 4 = PrefetchServableState::kNotServable // 1 = PrefetchMatchResolverAction::ActionKind::kDrop // 2 = PrefetchContainer::LoadState::kEligible // 1 = is_expired == false 144121, 1); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "FallbackAborted.Match0.PrefetchMatchMetrics.ExistsPaopThen.QueueSize", 5, 1); histogram_tester.ExpectUniqueSample( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "FallbackAborted.Match0.PrefetchMatchMetrics.ExistsPaopThen." "QueueIndexPlus1", 4, 1); histogram_tester.ExpectTotalCount( "PreloadServingMetrics.ForPrerenderInitialNavigationFailed." "FallbackAborted.Match1.PrefetchMatchMetrics.Count", 0); histogram_tester.ExpectUniqueSample("PreloadServingMetrics.Other.All", 0 /* kNoInstantLoad */, 1); histogram_tester.ExpectTotalCount("PreloadServingMetrics.Other.SRP", 0); } } // namespace content