[omnibox] Adds a histogram to record different types of remote requests

Also cleans up enum names for provider-specific histograms around
remote requests.

OBSOLETE_HISTOGRAMS=Replaces Omnibox.SuggestRequests with Omnibox.SearchSuggest.Requests

Bug: 1516795
Change-Id: I560ac5de3dd608067a8af78dde712648a11c50c7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5254505
Commit-Queue: Moe Ahmadi <mahmadi@chromium.org>
Reviewed-by: Sophie Chang <sophiechang@chromium.org>
Reviewed-by: Tomasz Wiszkowski <ender@google.com>
Cr-Commit-Position: refs/heads/main@{#1255844}

components/omnibox/browser/document_provider.cc

@@ -43,7 +43,7 @@
 #include "components/omnibox/browser/omnibox_field_trial.h"
 #include "components/omnibox/browser/omnibox_prefs.h"
 #include "components/omnibox/browser/remote_suggestions_service.h"
-#include "components/omnibox/browser/search_provider.h"
+#include "components/omnibox/browser/search_suggestion_parser.h"
 #include "components/omnibox/common/omnibox_features.h"
 #include "components/pref_registry/pref_registry_syncable.h"
 #include "components/prefs/pref_service.h"
@@ -87,10 +87,9 @@ enum class DocumentProviderAllowedReason : int {
   kMaxValue = kInputLooksLikeUrl
 };
 
-void LogOmniboxDocumentRequest(RemoteRequestHistogramValue request_value) {
+void LogOmniboxDocumentRequest(RemoteRequestEvent request_event) {
   base::UmaHistogramEnumeration("Omnibox.DocumentSuggest.Requests",
-                                request_value,
-                                RemoteRequestHistogramValue::kMaxValue);
+                                request_event);
 }
 
 void LogTotalTime(base::TimeTicks start_time, bool interrupted) {
@@ -514,7 +513,7 @@ void DocumentProvider::Stop(bool clear_cached_results,
     loader_.reset();
     LogRequestTime(time_request_sent_, true);
     time_request_sent_ = base::TimeTicks();
-    LogOmniboxDocumentRequest(RemoteRequestHistogramValue::kRequestInvalidated);
+    LogOmniboxDocumentRequest(RemoteRequestEvent::kRequestInvalidated);
   }
 
   // If `Run()` has been invoked, log its duration. It's possible `Stop()` is
@@ -565,8 +564,7 @@ void DocumentProvider::OnURLLoadComplete(
   DCHECK_EQ(loader_.get(), source);
 
   LogRequestTime(time_request_sent_, false);
-  LogOmniboxDocumentRequest(
-      RemoteRequestHistogramValue::kRemoteResponseReceived);
+  LogOmniboxDocumentRequest(RemoteRequestEvent::kResponseReceived);
   base::UmaHistogramSparse("Omnibox.DocumentSuggest.HttpResponseCode",
                            response_code);
 
@@ -621,7 +619,7 @@ void DocumentProvider::OnDocumentSuggestionsLoaderAvailable(
     std::unique_ptr<network::SimpleURLLoader> loader) {
   time_request_sent_ = base::TimeTicks::Now();
   loader_ = std::move(loader);
-  LogOmniboxDocumentRequest(RemoteRequestHistogramValue::kRequestSent);
+  LogOmniboxDocumentRequest(RemoteRequestEvent::kRequestSent);
 }
 
 // static

components/omnibox/browser/document_provider.h

@@ -21,7 +21,6 @@
 #include "components/history/core/browser/history_types.h"
 #include "components/omnibox/browser/autocomplete_provider.h"
 #include "components/omnibox/browser/autocomplete_provider_debouncer.h"
-#include "components/omnibox/browser/search_provider.h"
 #include "third_party/metrics_proto/omnibox_event.pb.h"
 
 class AutocompleteProviderListener;

components/omnibox/browser/remote_suggestions_service.cc

@@ -8,6 +8,7 @@
 #include <utility>
 
 #include "base/functional/bind.h"
+#include "base/metrics/histogram_functions.h"
 #include "components/omnibox/browser/base_search_provider.h"
 #include "components/omnibox/browser/document_suggestions_service.h"
 #include "components/search_engines/template_url_service.h"
@@ -21,6 +22,10 @@
 
 namespace {
 
+void LogSuggestRequestSent(RemoteRequestType request_type) {
+  base::UmaHistogramEnumeration("Omnibox.SuggestRequestsSent", request_type);
+}
+
 void AddVariationHeaders(network::ResourceRequest* request) {
   // Note: It's OK to pass InIncognito::kNo since we are expected to be in
   // non-incognito state here (i.e. remote suggestions are not served in
@@ -59,6 +64,7 @@ GURL RemoteSuggestionsService::EndpointUrl(
 
 std::unique_ptr<network::SimpleURLLoader>
 RemoteSuggestionsService::StartSuggestionsRequest(
+    RemoteRequestType request_type,
     const TemplateURL* template_url,
     TemplateURLRef::SearchTermsArgs search_terms_args,
     const SearchTermsData& search_terms_data,
@@ -129,12 +135,13 @@ RemoteSuggestionsService::StartSuggestionsRequest(
     observer.OnSuggestRequestStarted(request_id, loader.get(),
                                      /*request_body*/ "");
   }
-
+  LogSuggestRequestSent(request_type);
   return loader;
 }
 
 std::unique_ptr<network::SimpleURLLoader>
 RemoteSuggestionsService::StartZeroPrefixSuggestionsRequest(
+    RemoteRequestType request_type,
     const TemplateURL* template_url,
     TemplateURLRef::SearchTermsArgs search_terms_args,
     const SearchTermsData& search_terms_data,
@@ -210,7 +217,7 @@ RemoteSuggestionsService::StartZeroPrefixSuggestionsRequest(
     observer.OnSuggestRequestStarted(request_id, loader.get(),
                                      /*request_body*/ "");
   }
-
+  LogSuggestRequestSent(request_type);
   return loader;
 }
 
@@ -311,7 +318,7 @@ RemoteSuggestionsService::StartDeletionRequest(
     observer.OnSuggestRequestStarted(request_id, loader.get(),
                                      /*request_body*/ "");
   }
-
+  LogSuggestRequestSent(RemoteRequestType::kDeletion);
   return loader;
 }
 
@@ -346,7 +353,7 @@ void RemoteSuggestionsService::OnDocumentSuggestionsLoaderAvailable(
   for (Observer& observer : observers_) {
     observer.OnSuggestRequestStarted(request_id, loader.get(), request_body);
   }
-
+  LogSuggestRequestSent(RemoteRequestType::kDocumentSuggest);
   std::move(start_callback).Run(std::move(loader));
 }
 

components/omnibox/browser/remote_suggestions_service.h

@@ -28,8 +28,54 @@ class SimpleURLLoader;
 struct ResourceRequest;
 }  // namespace network
 
+// The types of requests for remote suggestions.
+// These values are written to logs. New enum values can be added, but existing
+// enums must never be renumbered or deleted and reused.
+enum class RemoteRequestType {
+  // Search suggestion requests.
+  kSearch = 0,
+  // Search suggestion warm-up requests.
+  kSearchWarmup = 1,
+  // Search suggestion requests to obtain images.
+  kImages = 2,
+  // Zero-prefix suggestion requests.
+  kZeroSuggest = 3,
+  // Zero-prefix suggestion prefetching requests.
+  kZeroSuggestPrefetch = 4,
+  // Document suggestion requests.
+  kDocumentSuggest = 5,
+  // Suggestion deletion requests.
+  kDeletion = 6,
+  kMaxValue = kDeletion,
+};
+
+// The event types recorded by the providers for remote suggestions. Each event
+// must be logged at most once from when the provider is started until it is
+// stopped.
+// These values are written to logs. New enum values can be added, but existing
+// enums must never be renumbered or deleted and reused.
+enum class RemoteRequestEvent {
+  // Cached response was synchronously converted to displayed matches.
+  // Recorded for non-prefetch requests only.
+  kCachedResponseConvertedToMatches = 0,
+  // Request was sent.
+  kRequestSent = 1,
+  // Request was invalidated.
+  kRequestInvalidated = 2,
+  // Response was received asynchronously.
+  kResponseReceived = 3,
+  // Response was cached.
+  kResponseCached = 4,
+  // Response ended up being converted to displayed matches. This may happen due
+  // to an empty displayed result set or an empty remote result set.
+  // Recorded for non-prefetch requests only.
+  kResponseConvertedToMatches = 5,
+  kMaxValue = kResponseConvertedToMatches,
+};
+
 // A service to fetch suggestions from a search provider's suggest endpoint.
-// Used by the ZeroSuggestProvider, the SearchProvider, and the ImageService.
+// Used by ZeroSuggestProvider, SearchProvider, DocumentProvider, and
+// ImageService.
 //
 // This service is always sent the user's authentication state, so the
 // suggestions always can be personalized. This service is also sometimes sent
@@ -93,6 +139,7 @@ class RemoteSuggestionsService : public KeyedService {
   // `search_terms_data` is used to build the endpoint URL.
   // `completion_callback` will be invoked when the transfer is done.
   std::unique_ptr<network::SimpleURLLoader> StartSuggestionsRequest(
+      RemoteRequestType request_type,
       const TemplateURL* template_url,
       TemplateURLRef::SearchTermsArgs search_terms_args,
       const SearchTermsData& search_terms_data,
@@ -107,6 +154,7 @@ class RemoteSuggestionsService : public KeyedService {
   // `search_terms_data` is used to build the endpoint URL.
   // `completion_callback` will be invoked when the transfer is done.
   std::unique_ptr<network::SimpleURLLoader> StartZeroPrefixSuggestionsRequest(
+      RemoteRequestType request_type,
       const TemplateURL* template_url,
       TemplateURLRef::SearchTermsArgs search_terms_args,
       const SearchTermsData& search_terms_data,

components/omnibox/browser/remote_suggestions_service_unittest.cc

@@ -10,6 +10,7 @@
 #include "base/functional/bind.h"
 #include "base/memory/scoped_refptr.h"
 #include "base/test/bind.h"
+#include "base/test/metrics/histogram_tester.h"
 #include "base/test/task_environment.h"
 #include "components/search_engines/template_url_service.h"
 #include "components/variations/scoped_variations_ids_provider.h"
@@ -102,7 +103,8 @@ TEST_F(RemoteSuggestionsServiceTest, EnsureAttachCookies_ZeroPrefixSuggest) {
       /*prefs=*/nullptr, /*search_engine_choice_service=*/nullptr);
   TemplateURLRef::SearchTermsArgs search_terms_args;
   search_terms_args.current_page_url = "https://www.google.com/";
-  service.StartZeroPrefixSuggestionsRequest(
+  auto loader = service.StartZeroPrefixSuggestionsRequest(
+      RemoteRequestType::kZeroSuggest,
       template_url_service.GetDefaultSearchProvider(), search_terms_args,
       template_url_service.search_terms_data(),
       base::BindOnce(&RemoteSuggestionsServiceTest::OnRequestComplete,
@@ -132,7 +134,8 @@ TEST_F(RemoteSuggestionsServiceTest, EnsureAttachCookies_Suggest) {
       /*prefs=*/nullptr, /*search_engine_choice_service=*/nullptr);
   TemplateURLRef::SearchTermsArgs search_terms_args;
   search_terms_args.current_page_url = "https://www.google.com/";
-  service.StartSuggestionsRequest(
+  auto loader = service.StartSuggestionsRequest(
+      RemoteRequestType::kSearch,
       template_url_service.GetDefaultSearchProvider(), search_terms_args,
       template_url_service.search_terms_data(),
       base::BindOnce(&RemoteSuggestionsServiceTest::OnRequestComplete,
@@ -157,7 +160,7 @@ TEST_F(RemoteSuggestionsServiceTest, EnsureAttachCookies_DeleteSuggest) {
 
   RemoteSuggestionsService service(/*document_suggestions_service_=*/nullptr,
                                    GetUrlLoaderFactory());
-  service.StartDeletionRequest(
+  auto loader = service.StartDeletionRequest(
       "https://google.com/complete/delete",
       base::BindOnce(&RemoteSuggestionsServiceTest::OnRequestComplete,
                      base::Unretained(this)));
@@ -183,7 +186,8 @@ TEST_F(RemoteSuggestionsServiceTest, EnsureBypassCache) {
   TemplateURLRef::SearchTermsArgs search_terms_args;
   search_terms_args.current_page_url = "https://www.google.com/";
   search_terms_args.bypass_cache = true;
-  service.StartZeroPrefixSuggestionsRequest(
+  auto loader = service.StartZeroPrefixSuggestionsRequest(
+      RemoteRequestType::kZeroSuggest,
       template_url_service.GetDefaultSearchProvider(), search_terms_args,
       template_url_service.search_terms_data(),
       base::BindOnce(&RemoteSuggestionsServiceTest::OnRequestComplete,
@@ -202,6 +206,8 @@ TEST_F(RemoteSuggestionsServiceTest, EnsureBypassCache) {
 }
 
 TEST_F(RemoteSuggestionsServiceTest, EnsureObservers) {
+  base::HistogramTester histogram_tester;
+
   TemplateURLService template_url_service(
       /*prefs=*/nullptr, /*search_engine_choice_service=*/nullptr);
   TemplateURLData template_url_data;
@@ -212,10 +218,9 @@ TEST_F(RemoteSuggestionsServiceTest, EnsureObservers) {
 
   RemoteSuggestionsService service(/*document_suggestions_service_=*/nullptr,
                                    GetUrlLoaderFactory());
-
   TestObserver observer(&service);
-
   auto loader = service.StartZeroPrefixSuggestionsRequest(
+      RemoteRequestType::kZeroSuggest,
       template_url_service.GetDefaultSearchProvider(),
       TemplateURLRef::SearchTermsArgs(),
       template_url_service.search_terms_data(),
@@ -236,6 +241,10 @@ TEST_F(RemoteSuggestionsServiceTest, EnsureObservers) {
 
   base::RunLoop().RunUntilIdle();
 
+  // Verify histogram was recorded.
+  histogram_tester.ExpectTotalCount("Omnibox.SuggestRequestsSent", 1);
+  histogram_tester.ExpectBucketCount("Omnibox.SuggestRequestsSent", 3, 1);
+
   // Verify the observer got notified of request completion.
   ASSERT_EQ(observer.url().spec(), kRequestUrl);
   ASSERT_TRUE(observer.response_received());

components/omnibox/browser/search_provider.cc

@@ -69,10 +69,10 @@ using metrics::OmniboxEventProto;
 
 namespace {
 
-// Increments the appropriate value in the histogram by one.
-void LogOmniboxSuggestRequest(RemoteRequestHistogramValue request_value) {
-  base::UmaHistogramEnumeration("Omnibox.SuggestRequests", request_value,
-                                RemoteRequestHistogramValue::kMaxValue);
+// Increments the appropriate event in the histogram by one.
+void LogOmniboxSuggestRequest(RemoteRequestEvent request_event) {
+  base::UmaHistogramEnumeration("Omnibox.SearchSuggest.Requests",
+                                request_event);
 }
 
 bool HasMultipleWords(const std::u16string& text) {
@@ -514,8 +514,7 @@ void SearchProvider::SortResults(bool is_keyword,
 }
 
 void SearchProvider::LogLoadComplete(bool success, bool is_keyword) {
-  LogOmniboxSuggestRequest(
-      RemoteRequestHistogramValue::kRemoteResponseReceived);
+  LogOmniboxSuggestRequest(RemoteRequestEvent::kResponseReceived);
   // Record response time for suggest requests sent to Google.  We care
   // only about the common case: the Google default provider used in
   // non-keyword mode.
@@ -762,7 +761,7 @@ void SearchProvider::StartOrStopSuggestQuery(bool minimal_changes) {
 void SearchProvider::CancelLoader(
     std::unique_ptr<network::SimpleURLLoader>* loader) {
   if (*loader) {
-    LogOmniboxSuggestRequest(RemoteRequestHistogramValue::kRequestInvalidated);
+    LogOmniboxSuggestRequest(RemoteRequestEvent::kRequestInvalidated);
     loader->reset();
   }
 }
@@ -924,7 +923,7 @@ std::unique_ptr<network::SimpleURLLoader> SearchProvider::CreateSuggestLoader(
     search_term_args.current_page_url = input.current_url().spec();
   }
 
-  LogOmniboxSuggestRequest(RemoteRequestHistogramValue::kRequestSent);
+  LogOmniboxSuggestRequest(RemoteRequestEvent::kRequestSent);
 
   // If the request is from omnibox focus, send empty search term args. The
   // purpose of such a request is to signal the server to warm up; no info
@@ -932,6 +931,8 @@ std::unique_ptr<network::SimpleURLLoader> SearchProvider::CreateSuggestLoader(
   return client()
       ->GetRemoteSuggestionsService(/*create_if_necessary=*/true)
       ->StartSuggestionsRequest(
+          input.IsZeroSuggest() ? RemoteRequestType::kSearchWarmup
+                                : RemoteRequestType::kSearch,
           template_url,
           input.IsZeroSuggest() ? TemplateURLRef::SearchTermsArgs()
                                 : search_term_args,

components/omnibox/browser/search_provider.h

@@ -41,31 +41,6 @@ namespace network {
 class SimpleURLLoader;
 }
 
-// The provider event types recorded as a result of prefetch and non-prefetch
-// requests for zero-prefix suggestions. Each event must be logged at most once
-// from when the provider is started until it is stopped.
-// These values are written to logs. New enum values can be added, but existing
-// enums must never be renumbered or deleted and reused.
-enum class RemoteRequestHistogramValue {
-  // Cached response was synchronously converted to displayed matches.
-  // Recorded for non-prefetch requests only.
-  kCachedResponseConvertedToMatches = 0,
-  // Remote request was sent.
-  kRequestSent = 1,
-  // Remote request was invalidated.
-  kRequestInvalidated = 2,
-  // Remote response was received asynchronously.
-  kRemoteResponseReceived = 3,
-  // Remote response was cached.
-  kRemoteResponseCached = 4,
-  // Remote response ended up being converted to displayed matches. This may
-  // happen due to an empty displayed result set or an empty remote result set.
-  // Recorded for non-prefetch requests only.
-  kRemoteResponseConvertedToMatches = 5,
-
-  kMaxValue = kRemoteResponseConvertedToMatches,
-};
-
 // Autocomplete provider for searches and suggestions from a search engine.
 //
 // After construction, the autocomplete controller repeatedly calls Start()

components/omnibox/browser/zero_suggest_provider.cc

@@ -30,7 +30,6 @@
 #include "components/omnibox/browser/omnibox_triggered_feature_service.h"
 #include "components/omnibox/browser/page_classification_functions.h"
 #include "components/omnibox/browser/remote_suggestions_service.h"
-#include "components/omnibox/browser/search_provider.h"
 #include "components/omnibox/browser/search_suggestion_parser.h"
 #include "components/omnibox/browser/zero_suggest_cache_service.h"
 #include "components/omnibox/common/omnibox_features.h"
@@ -77,10 +76,9 @@ enum class Eligibility {
   kMaxValue = kGenerallyIneligible,
 };
 
-void LogOmniboxZeroSuggestRequest(
-    const RemoteRequestHistogramValue request_value,
-    const ResultType result_type,
-    const bool is_prefetch) {
+void LogOmniboxZeroSuggestRequest(const RemoteRequestEvent request_event,
+                                  const ResultType result_type,
+                                  const bool is_prefetch) {
   DCHECK_NE(ResultType::kNone, result_type);
 
   const std::string result_type_string =
@@ -89,7 +87,7 @@ void LogOmniboxZeroSuggestRequest(
       is_prefetch ? ".Prefetch" : ".NonPrefetch";
   base::UmaHistogramEnumeration(
       "Omnibox.ZeroSuggestProvider" + result_type_string + request_type_string,
-      request_value);
+      request_event);
 }
 
 // Relevance value to use if it was not set explicitly by the server.
@@ -211,9 +209,8 @@ bool StoreRemoteResponse(const std::string& response_json,
                                    : std::string();
   client->GetZeroSuggestCacheService()->StoreZeroSuggestResponse(page_url,
                                                                  response_json);
-  LogOmniboxZeroSuggestRequest(
-      RemoteRequestHistogramValue::kRemoteResponseCached, result_type,
-      is_prefetch);
+  LogOmniboxZeroSuggestRequest(RemoteRequestEvent::kResponseCached, result_type,
+                               is_prefetch);
   return true;
 }
 
@@ -404,9 +401,9 @@ void ZeroSuggestProvider::StartPrefetch(const AutocompleteInput& input) {
   }
 
   if (*prefetch_loader) {
-    LogOmniboxZeroSuggestRequest(
-        RemoteRequestHistogramValue::kRequestInvalidated, result_type,
-        /*is_prefetch=*/true);
+    LogOmniboxZeroSuggestRequest(RemoteRequestEvent::kRequestInvalidated,
+                                 result_type,
+                                 /*is_prefetch=*/true);
   }
 
   // Create a loader for the appropriate page context and take ownership of it.
@@ -414,14 +411,13 @@ void ZeroSuggestProvider::StartPrefetch(const AutocompleteInput& input) {
       client()
           ->GetRemoteSuggestionsService(/*create_if_necessary=*/true)
           ->StartZeroPrefixSuggestionsRequest(
-              template_url, search_terms_args,
-              template_url_service->search_terms_data(),
+              RemoteRequestType::kZeroSuggestPrefetch, template_url,
+              search_terms_args, template_url_service->search_terms_data(),
               base::BindOnce(&ZeroSuggestProvider::OnPrefetchURLLoadComplete,
                              weak_ptr_factory_.GetWeakPtr(), input,
                              result_type));
 
-  LogOmniboxZeroSuggestRequest(RemoteRequestHistogramValue::kRequestSent,
-                               result_type,
+  LogOmniboxZeroSuggestRequest(RemoteRequestEvent::kRequestSent, result_type,
                                /*is_prefetch=*/true);
 }
 
@@ -444,7 +440,7 @@ void ZeroSuggestProvider::Start(const AutocompleteInput& input,
   if (ReadStoredResponse(client(), input, result_type_running_, &results)) {
     ConvertSuggestResultsToAutocompleteMatches(results, input);
     LogOmniboxZeroSuggestRequest(
-        RemoteRequestHistogramValue::kCachedResponseConvertedToMatches,
+        RemoteRequestEvent::kCachedResponseConvertedToMatches,
         result_type_running_,
         /*is_prefetch=*/false);
   }
@@ -471,16 +467,17 @@ void ZeroSuggestProvider::Start(const AutocompleteInput& input,
           : std::string();
 
   // Create a loader for the request and take ownership of it.
-  loader_ = client()
-                ->GetRemoteSuggestionsService(/*create_if_necessary=*/true)
-                ->StartZeroPrefixSuggestionsRequest(
-                    template_url, search_terms_args,
-                    template_url_service->search_terms_data(),
-                    base::BindOnce(&ZeroSuggestProvider::OnURLLoadComplete,
-                                   weak_ptr_factory_.GetWeakPtr(), input,
-                                   result_type_running_));
+  loader_ =
+      client()
+          ->GetRemoteSuggestionsService(/*create_if_necessary=*/true)
+          ->StartZeroPrefixSuggestionsRequest(
+              RemoteRequestType::kZeroSuggest, template_url, search_terms_args,
+              template_url_service->search_terms_data(),
+              base::BindOnce(&ZeroSuggestProvider::OnURLLoadComplete,
+                             weak_ptr_factory_.GetWeakPtr(), input,
+                             result_type_running_));
 
-  LogOmniboxZeroSuggestRequest(RemoteRequestHistogramValue::kRequestSent,
+  LogOmniboxZeroSuggestRequest(RemoteRequestEvent::kRequestSent,
                                result_type_running_,
                                /*is_prefetch=*/false);
 }
@@ -490,9 +487,9 @@ void ZeroSuggestProvider::Stop(bool clear_cached_results,
   AutocompleteProvider::Stop(clear_cached_results, due_to_user_inactivity);
 
   if (loader_) {
-    LogOmniboxZeroSuggestRequest(
-        RemoteRequestHistogramValue::kRequestInvalidated, result_type_running_,
-        /*is_prefetch=*/false);
+    LogOmniboxZeroSuggestRequest(RemoteRequestEvent::kRequestInvalidated,
+                                 result_type_running_,
+                                 /*is_prefetch=*/false);
     loader_.reset();
   }
   result_type_running_ = ResultType::kNone;
@@ -558,9 +555,9 @@ void ZeroSuggestProvider::OnURLLoadComplete(
     return;
   }
 
-  LogOmniboxZeroSuggestRequest(
-      RemoteRequestHistogramValue::kRemoteResponseReceived, result_type,
-      /*is_prefetch=*/false);
+  LogOmniboxZeroSuggestRequest(RemoteRequestEvent::kResponseReceived,
+                               result_type,
+                               /*is_prefetch=*/false);
 
   SearchSuggestionParser::Results results;
   const bool response_parsed = StoreRemoteResponse(
@@ -588,10 +585,9 @@ void ZeroSuggestProvider::OnURLLoadComplete(
 
   // Convert the response to |matches_| and notify the listeners.
   ConvertSuggestResultsToAutocompleteMatches(results, input);
-  LogOmniboxZeroSuggestRequest(
-      RemoteRequestHistogramValue::kRemoteResponseConvertedToMatches,
-      result_type,
-      /*is_prefetch=*/false);
+  LogOmniboxZeroSuggestRequest(RemoteRequestEvent::kResponseConvertedToMatches,
+                               result_type,
+                               /*is_prefetch=*/false);
   NotifyListeners(/*updated_matches=*/true);
 }
 
@@ -615,9 +611,9 @@ void ZeroSuggestProvider::OnPrefetchURLLoadComplete(
   DCHECK_EQ(prefetch_loader->get(), source);
 
   if (response_code == 200) {
-    LogOmniboxZeroSuggestRequest(
-        RemoteRequestHistogramValue::kRemoteResponseReceived, result_type,
-        /*is_prefetch=*/true);
+    LogOmniboxZeroSuggestRequest(RemoteRequestEvent::kResponseReceived,
+                                 result_type,
+                                 /*is_prefetch=*/true);
 
     SearchSuggestionParser::Results unused_results;
     StoreRemoteResponse(SearchSuggestionParser::ExtractJsonData(

components/omnibox/browser/zero_suggest_provider.h

@@ -14,7 +14,6 @@
 
 #include "base/gtest_prod_util.h"
 #include "components/omnibox/browser/base_search_provider.h"
-#include "components/omnibox/browser/search_provider.h"
 
 class AutocompleteProviderListener;
 class PrefRegistrySimple;

components/omnibox/browser/zero_suggest_provider_unittest.cc

@@ -1249,7 +1249,7 @@ TEST_F(ZeroSuggestProviderTest, TestPsuggestZeroSuggestCachingFirstRunNTP) {
       "Omnibox.ZeroSuggestProvider.NoURL.NonPrefetch", /*kRequestSent*/ 1, 1);
   histogram_tester.ExpectBucketCount(
       "Omnibox.ZeroSuggestProvider.NoURL.NonPrefetch",
-      /*kRemoteResponseReceived*/ 3, 1);
+      /*kResponseReceived*/ 3, 1);
   histogram_tester.ExpectBucketCount(
       "Omnibox.ZeroSuggestProvider.NoURL.NonPrefetch",
       /*kRemoteResponseCached*/ 4, 1);
@@ -1315,7 +1315,7 @@ TEST_F(ZeroSuggestProviderTest, TestPsuggestZeroSuggestCachingFirstRunSRP) {
       1);
   histogram_tester.ExpectBucketCount(
       "Omnibox.ZeroSuggestProvider.URLBased.NonPrefetch",
-      /*kRemoteResponseReceived*/ 3, 1);
+      /*kResponseReceived*/ 3, 1);
   histogram_tester.ExpectBucketCount(
       "Omnibox.ZeroSuggestProvider.URLBased.NonPrefetch",
       /*kRemoteResponseCached*/ 4, 1);
@@ -1382,7 +1382,7 @@ TEST_F(ZeroSuggestProviderTest, TestPsuggestZeroSuggestCachingFirstRunWeb) {
       1);
   histogram_tester.ExpectBucketCount(
       "Omnibox.ZeroSuggestProvider.URLBased.NonPrefetch",
-      /*kRemoteResponseReceived*/ 3, 1);
+      /*kResponseReceived*/ 3, 1);
   histogram_tester.ExpectBucketCount(
       "Omnibox.ZeroSuggestProvider.URLBased.NonPrefetch",
       /*kRemoteResponseCached*/ 4, 1);
@@ -1579,7 +1579,7 @@ TEST_F(ZeroSuggestProviderTest, TestPsuggestZeroSuggestHasCachedResultsNTP) {
       "Omnibox.ZeroSuggestProvider.NoURL.NonPrefetch", /*kRequestSent*/ 1, 1);
   histogram_tester.ExpectBucketCount(
       "Omnibox.ZeroSuggestProvider.NoURL.NonPrefetch",
-      /*kRemoteResponseReceived*/ 3, 1);
+      /*kResponseReceived*/ 3, 1);
   histogram_tester.ExpectBucketCount(
       "Omnibox.ZeroSuggestProvider.NoURL.NonPrefetch",
       /*kRemoteResponseCached*/ 4, 1);
@@ -1657,7 +1657,7 @@ TEST_F(ZeroSuggestProviderTest, TestZeroSuggestHasInMemoryCachedResultsNTP) {
       "Omnibox.ZeroSuggestProvider.NoURL.NonPrefetch", /*kRequestSent*/ 1, 1);
   histogram_tester.ExpectBucketCount(
       "Omnibox.ZeroSuggestProvider.NoURL.NonPrefetch",
-      /*kRemoteResponseReceived*/ 3, 1);
+      /*kResponseReceived*/ 3, 1);
   histogram_tester.ExpectBucketCount(
       "Omnibox.ZeroSuggestProvider.NoURL.NonPrefetch",
       /*kRemoteResponseCached*/ 4, 1);
@@ -1741,7 +1741,7 @@ TEST_F(ZeroSuggestProviderTest, TestPsuggestZeroSuggestHasCachedResultsSRP) {
       1);
   histogram_tester.ExpectBucketCount(
       "Omnibox.ZeroSuggestProvider.URLBased.NonPrefetch",
-      /*kRemoteResponseReceived*/ 3, 1);
+      /*kResponseReceived*/ 3, 1);
   histogram_tester.ExpectBucketCount(
       "Omnibox.ZeroSuggestProvider.URLBased.NonPrefetch",
       /*kRemoteResponseCached*/ 4, 1);
@@ -1827,7 +1827,7 @@ TEST_F(ZeroSuggestProviderTest, TestZeroSuggestHasInMemoryCachedResultsSRP) {
       1);
   histogram_tester.ExpectBucketCount(
       "Omnibox.ZeroSuggestProvider.URLBased.NonPrefetch",
-      /*kRemoteResponseReceived*/ 3, 1);
+      /*kResponseReceived*/ 3, 1);
   histogram_tester.ExpectBucketCount(
       "Omnibox.ZeroSuggestProvider.URLBased.NonPrefetch",
       /*kRemoteResponseCached*/ 4, 1);
@@ -1912,7 +1912,7 @@ TEST_F(ZeroSuggestProviderTest, TestPsuggestZeroSuggestHasCachedResultsWeb) {
       1);
   histogram_tester.ExpectBucketCount(
       "Omnibox.ZeroSuggestProvider.URLBased.NonPrefetch",
-      /*kRemoteResponseReceived*/ 3, 1);
+      /*kResponseReceived*/ 3, 1);
   histogram_tester.ExpectBucketCount(
       "Omnibox.ZeroSuggestProvider.URLBased.NonPrefetch",
       /*kRemoteResponseCached*/ 4, 1);
@@ -1998,7 +1998,7 @@ TEST_F(ZeroSuggestProviderTest, TestZeroSuggestHasInMemoryCachedResultsWeb) {
       1);
   histogram_tester.ExpectBucketCount(
       "Omnibox.ZeroSuggestProvider.URLBased.NonPrefetch",
-      /*kRemoteResponseReceived*/ 3, 1);
+      /*kResponseReceived*/ 3, 1);
   histogram_tester.ExpectBucketCount(
       "Omnibox.ZeroSuggestProvider.URLBased.NonPrefetch",
       /*kRemoteResponseCached*/ 4, 1);
@@ -2073,7 +2073,7 @@ TEST_F(ZeroSuggestProviderTest,
       "Omnibox.ZeroSuggestProvider.NoURL.NonPrefetch", /*kRequestSent*/ 1, 1);
   histogram_tester.ExpectBucketCount(
       "Omnibox.ZeroSuggestProvider.NoURL.NonPrefetch",
-      /*kRemoteResponseReceived*/ 3, 1);
+      /*kResponseReceived*/ 3, 1);
   histogram_tester.ExpectBucketCount(
       "Omnibox.ZeroSuggestProvider.NoURL.NonPrefetch",
       /*kRemoteResponseCached*/ 4, 1);
@@ -2154,7 +2154,7 @@ TEST_F(ZeroSuggestProviderTest,
       1);
   histogram_tester.ExpectBucketCount(
       "Omnibox.ZeroSuggestProvider.URLBased.NonPrefetch",
-      /*kRemoteResponseReceived*/ 3, 1);
+      /*kResponseReceived*/ 3, 1);
   histogram_tester.ExpectBucketCount(
       "Omnibox.ZeroSuggestProvider.URLBased.NonPrefetch",
       /*kRemoteResponseCached*/ 4, 1);
@@ -2236,7 +2236,7 @@ TEST_F(ZeroSuggestProviderTest,
       1);
   histogram_tester.ExpectBucketCount(
       "Omnibox.ZeroSuggestProvider.URLBased.NonPrefetch",
-      /*kRemoteResponseReceived*/ 3, 1);
+      /*kResponseReceived*/ 3, 1);
   histogram_tester.ExpectBucketCount(
       "Omnibox.ZeroSuggestProvider.URLBased.NonPrefetch",
       /*kRemoteResponseCached*/ 4, 1);
@@ -2310,7 +2310,7 @@ TEST_F(ZeroSuggestProviderTest, TestZeroSuggestReceivedInvalidResults) {
       invalid_responses.size());
   histogram_tester.ExpectBucketCount(
       "Omnibox.ZeroSuggestProvider.NoURL.NonPrefetch",
-      /*kRemoteResponseReceived*/ 3, invalid_responses.size());
+      /*kResponseReceived*/ 3, invalid_responses.size());
   histogram_tester.ExpectBucketCount(
       "Omnibox.ZeroSuggestProvider.NoURL.NonPrefetch",
       /*kRemoteResponseCached*/ 4, 0);
@@ -2369,7 +2369,7 @@ TEST_F(ZeroSuggestProviderTest, TestPsuggestZeroSuggestPrefetchThenNTPOnFocus) {
         "Omnibox.ZeroSuggestProvider.NoURL.Prefetch", /*kRequestSent*/ 1, 1);
     histogram_tester.ExpectBucketCount(
         "Omnibox.ZeroSuggestProvider.NoURL.Prefetch",
-        /*kRemoteResponseReceived*/ 3, 1);
+        /*kResponseReceived*/ 3, 1);
     histogram_tester.ExpectBucketCount(
         "Omnibox.ZeroSuggestProvider.NoURL.Prefetch",
         /*kRemoteResponseCached*/ 4, 1);
@@ -2430,7 +2430,7 @@ TEST_F(ZeroSuggestProviderTest, TestPsuggestZeroSuggestPrefetchThenNTPOnFocus) {
         "Omnibox.ZeroSuggestProvider.NoURL.NonPrefetch", /*kRequestSent*/ 1, 1);
     histogram_tester.ExpectBucketCount(
         "Omnibox.ZeroSuggestProvider.NoURL.NonPrefetch",
-        /*kRemoteResponseReceived*/ 3, 1);
+        /*kResponseReceived*/ 3, 1);
     histogram_tester.ExpectBucketCount(
         "Omnibox.ZeroSuggestProvider.NoURL.NonPrefetch",
         /*kRemoteResponseCached*/ 4, 1);
@@ -2519,7 +2519,7 @@ TEST_F(ZeroSuggestProviderTest, TestMultipleZeroSuggestPrefetchesInFlight) {
       /*kRequestInvalidated*/ 2, 0);
   histogram_tester.ExpectBucketCount(
       "Omnibox.ZeroSuggestProvider.URLBased.Prefetch",
-      /*kRemoteResponseReceived*/ 3, 1);
+      /*kResponseReceived*/ 3, 1);
   histogram_tester.ExpectBucketCount(
       "Omnibox.ZeroSuggestProvider.URLBased.Prefetch",
       /*kRemoteResponseCached*/ 4, 1);
@@ -2531,7 +2531,7 @@ TEST_F(ZeroSuggestProviderTest, TestMultipleZeroSuggestPrefetchesInFlight) {
       0);
   histogram_tester.ExpectBucketCount(
       "Omnibox.ZeroSuggestProvider.NoURL.Prefetch",
-      /*kRemoteResponseReceived*/ 3, 1);
+      /*kResponseReceived*/ 3, 1);
   histogram_tester.ExpectBucketCount(
       "Omnibox.ZeroSuggestProvider.NoURL.Prefetch",
       /*kRemoteResponseCached*/ 4, 1);
@@ -2613,7 +2613,7 @@ TEST_F(ZeroSuggestProviderTest,
         "Omnibox.ZeroSuggestProvider.URLBased.Prefetch", /*kRequestSent*/ 1, 1);
     histogram_tester.ExpectBucketCount(
         "Omnibox.ZeroSuggestProvider.URLBased.Prefetch",
-        /*kRemoteResponseReceived*/ 3, 1);
+        /*kResponseReceived*/ 3, 1);
 
     // Expect the provider to not have notified the provider listener since the
     // matches were not updated.
@@ -2669,7 +2669,7 @@ TEST_F(ZeroSuggestProviderTest,
         1);
     histogram_tester.ExpectBucketCount(
         "Omnibox.ZeroSuggestProvider.URLBased.NonPrefetch",
-        /*kRemoteResponseReceived*/ 3, 1);
+        /*kResponseReceived*/ 3, 1);
     histogram_tester.ExpectBucketCount(
         "Omnibox.ZeroSuggestProvider.URLBased.NonPrefetch",
         /*kRemoteResponseConvertedToMatches*/ 5, 1);
@@ -2749,7 +2749,7 @@ TEST_F(ZeroSuggestProviderTest,
         "Omnibox.ZeroSuggestProvider.URLBased.Prefetch", /*kRequestSent*/ 1, 1);
     histogram_tester.ExpectBucketCount(
         "Omnibox.ZeroSuggestProvider.URLBased.Prefetch",
-        /*kRemoteResponseReceived*/ 3, 1);
+        /*kResponseReceived*/ 3, 1);
 
     // Expect the provider to not have notified the provider listener since the
     // matches were not updated.
@@ -2804,7 +2804,7 @@ TEST_F(ZeroSuggestProviderTest,
         1);
     histogram_tester.ExpectBucketCount(
         "Omnibox.ZeroSuggestProvider.URLBased.NonPrefetch",
-        /*kRemoteResponseReceived*/ 3, 1);
+        /*kResponseReceived*/ 3, 1);
     histogram_tester.ExpectBucketCount(
         "Omnibox.ZeroSuggestProvider.URLBased.NonPrefetch",
         /*kRemoteResponseConvertedToMatches*/ 5, 1);
@@ -2889,7 +2889,7 @@ TEST_F(ZeroSuggestProviderTest, TestNoURLResultTypeWithNonEmptyURLInput) {
       "Omnibox.ZeroSuggestProvider.NoURL.NonPrefetch", /*kRequestSent*/ 1, 1);
   histogram_tester.ExpectBucketCount(
       "Omnibox.ZeroSuggestProvider.NoURL.NonPrefetch",
-      /*kRemoteResponseReceived*/ 3, 1);
+      /*kResponseReceived*/ 3, 1);
   histogram_tester.ExpectBucketCount(
       "Omnibox.ZeroSuggestProvider.NoURL.NonPrefetch",
       /*kRemoteResponseCached*/ 4, 1);

components/page_image_service/image_service.cc

@@ -76,7 +76,8 @@ class ImageService::SuggestEntityImageURLFetcher {
     search_terms_args.search_terms = search_query_;
 
     loader_ = remote_suggestions_service->StartSuggestionsRequest(
-        template_url, search_terms_args, search_terms_data,
+        RemoteRequestType::kImages, template_url, search_terms_args,
+        search_terms_data,
         base::BindOnce(&SuggestEntityImageURLFetcher::OnURLLoadComplete,
                        weak_factory_.GetWeakPtr()));
   }

tools/metrics/histograms/metadata/omnibox/enums.xml

@@ -75,6 +75,17 @@ chromium-metrics-reviews@google.com.
   <int value="12" label="Not allowed because the input looks like a URL"/>
 </enum>
 
+<enum name="DocumentSuggestRequestEvent">
+  <int value="1" label="requests sent">Request was sent.</int>
+  <int value="2" label="requests invalidated">
+    Request was invalidated (cancelled because URLLoader was deleted before the
+    callback was invoked).
+  </int>
+  <int value="3" label="responses received">
+    Response was received asynchronously.
+  </int>
+</enum>
+
 <enum name="GroupId">
   <summary>
     Suggestion group IDs toggled visible or hidden in the omnibox result list.
@@ -107,12 +118,6 @@ chromium-metrics-reviews@google.com.
   <int value="4" label="@tabs starter pack engine"/>
 </enum>
 
-<enum name="OmniboxDocumentSuggestRequests">
-  <int value="1" label="requests sent"/>
-  <int value="2" label="requests invalidated"/>
-  <int value="3" label="(non-invalidated) replies received"/>
-</enum>
-
 <enum name="OmniboxEnteredKeywordMode2">
   <int value="0" label="invalid"/>
   <int value="1" label="via tab"/>
@@ -159,37 +164,6 @@ chromium-metrics-reviews@google.com.
   <int value="4" label="Shortcut text prefix"/>
 </enum>
 
-<enum name="OmniboxSuggestRequests">
-  <int value="1" label="requests sent"/>
-  <int value="2" label="requests invalidated"/>
-  <int value="3" label="(non-invalidated) replies received"/>
-</enum>
-
-<enum name="OmniboxZeroSuggestRequests">
-  <obsolete>
-    Obsolete as of M105.
-  </obsolete>
-  <int value="1" label="requests sent">Suggest requests that were sent.</int>
-  <int value="2" label="requests invalidated">
-    Suggest requests that were invalidated, e.g., due to user starting to type.
-  </int>
-  <int value="3" label="responses received">
-    Suggest responses that were received. Includes both those received directly
-    from the server and those loaded from the HTTP cache.
-  </int>
-  <int value="4" label="responses loaded from HTTP cache">
-    Subset of Suggest responses that were loaded from the HTTP cache.
-  </int>
-  <int value="5"
-      label="out-of-date responses loaded from HTTP cache (deprecated)">
-    Subset of Suggest responses that were loaded from the HTTP cache and were
-    out-of-date.
-  </int>
-  <int value="6" label="responses updated displayed results">
-    Subset of Suggest responses that ended up updating the displayed results.
-  </int>
-</enum>
-
 <enum name="SearchPrefetchEligibilityReason">
   <int value="0" label="Prefetch started"/>
   <int value="1" label="User disabled prefetch/preconnect"/>
@@ -250,6 +224,17 @@ chromium-metrics-reviews@google.com.
   <int value="3" label="kCompleted"/>
 </enum>
 
+<enum name="SearchSuggestRequestEvent">
+  <int value="1" label="requests sent">Request was sent.</int>
+  <int value="2" label="requests invalidated">
+    Request was invalidated (cancelled because URLLoader was deleted before the
+    callback was invoked).
+  </int>
+  <int value="3" label="responses received">
+    Response was received asynchronously.
+  </int>
+</enum>
+
 <enum name="SuggestionAnswerOptionalType">
   <summary>
     Type of Answer in omnibox suggestion list or No Answer, if not an answer.
@@ -343,6 +328,16 @@ chromium-metrics-reviews@google.com.
   <int value="40" label="Set Chrome as default browser"/>
 </enum>
 
+<enum name="SuggestRequestType">
+  <int value="0" label="search suggestion"/>
+  <int value="1" label="search suggestion warm-up"/>
+  <int value="2" label="search suggestion for images"/>
+  <int value="3" label="zero-prefix suggestion"/>
+  <int value="4" label="zero-prefix suggestion prefetching"/>
+  <int value="5" label="document suggestion"/>
+  <int value="6" label="suggestion deletion"/>
+</enum>
+
 <enum name="ZeroSuggestEligibility">
   <int value="0" label="Eligible for current context and external conditions">
     Zero-prefix suggestions are eligible.
@@ -381,22 +376,23 @@ chromium-metrics-reviews@google.com.
   </int>
 </enum>
 
-<enum name="ZeroSuggestProviderEvent">
+<enum name="ZeroSuggestRequestEvent">
   <int value="0" label="cached response converted to results">
     Cached response was synchronously converted to displayed matches.
   </int>
-  <int value="1" label="request sent">Remote request was sent.</int>
+  <int value="1" label="request sent">Request was sent.</int>
   <int value="2" label="request invalidated">
-    Remote request was invalidated (due to user starting to type or another
-    zero-suggest request).
+    Request was invalidated (cancelled because URLLoader was deleted before the
+    callback was invoked).
   </int>
   <int value="3" label="response received">
-    Remote response was received asynchronously.
+    Response was received asynchronously.
   </int>
-  <int value="4" label="response cached">Remote response was cached.</int>
+  <int value="4" label="response cached">Response was cached.</int>
   <int value="5" label="response converted to results">
-    Remote response ended up being converted to displayed matches. This may
-    happen due to an empty displayed result set or an empty remote result set.
+    Response was converted to displayed matches. This can happen if the
+    displayed result set is empty and the response result set is non-empty; or
+    vice versa.
   </int>
 </enum>
 

tools/metrics/histograms/metadata/omnibox/histograms.xml

@@ -638,12 +638,12 @@ chromium-metrics-reviews@google.com.
 </histogram>
 
 <histogram name="Omnibox.DocumentSuggest.Requests"
-    enum="OmniboxDocumentSuggestRequests" expires_after="2024-06-30">
+    enum="DocumentSuggestRequestEvent" expires_after="2024-06-30">
   <owner>manukh@chromium.org</owner>
   <owner>jdonnelly@chromium.org</owner>
   <summary>
-    Counts the number of document suggest requests the omnibox sent, were
-    invalidated, and were completed successfully.
+    Counts the number of requests DocumentProvider sent, were invalidated, and
+    were completed successfully.
   </summary>
 </histogram>
 
@@ -1602,6 +1602,17 @@ chromium-metrics-reviews@google.com.
   </summary>
 </histogram>
 
+<histogram name="Omnibox.SearchSuggest.Requests"
+    enum="SearchSuggestRequestEvent" expires_after="2024-06-30">
+  <owner>mpearson@chromium.org</owner>
+  <owner>jdonnelly@chromium.org</owner>
+  <owner>cch@chromium.org</owner>
+  <summary>
+    Counts the number of requests SearchProvider sent, were invalidated, and
+    were completed successfully.
+  </summary>
+</histogram>
+
 <histogram name="Omnibox.SetText.Duration" units="ms"
     expires_after="2024-06-01">
   <owner>peilinwang@google.com</owner>
@@ -2173,14 +2184,14 @@ chromium-metrics-reviews@google.com.
   </summary>
 </histogram>
 
-<histogram name="Omnibox.SuggestRequests" enum="OmniboxSuggestRequests"
-    expires_after="2024-06-30">
-  <owner>mpearson@chromium.org</owner>
-  <owner>jdonnelly@chromium.org</owner>
-  <owner>cch@chromium.org</owner>
+<histogram name="Omnibox.SuggestRequestsSent" enum="SuggestRequestType"
+    expires_after="2025-01-31">
+  <owner>mahmadi@chromium.org</owner>
+  <owner>chrome-omnibox-team@google.com</owner>
   <summary>
-    Counts about the number of suggest requests the omnibox sent, invalidated,
-    and replies received.
+    Counts the number and type of requests sent by the omnibox to the Suggest
+    backends. These requests are emitted as the user types or in zero-suggest
+    context (user has focused or cleared the omnibox but has not typed in yet).
   </summary>
 </histogram>
 
@@ -2473,7 +2484,7 @@ chromium-metrics-reviews@google.com.
 </histogram>
 
 <histogram name="Omnibox.ZeroSuggestProvider.{ResultType}.{RequestType}"
-    enum="ZeroSuggestProviderEvent" expires_after="2024-06-30">
+    enum="ZeroSuggestRequestEvent" expires_after="2024-06-30">
   <owner>mahmadi@chromium.org</owner>
   <owner>chrome-omnibox-team@google.com</owner>
   <summary>