[Structured Metrics] Add Event when Sturctured Metrics is initialized.

This is to monitor whether the client is properly initialized and the
event flows through end to end.

Bug: 1238197
Change-Id: Ieec2a418671e45063adbf53dfa9ed70d98e8565f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3191757
Commit-Queue: Jong Ahn <[email protected]>
Reviewed-by: Tony Yeoman <[email protected]>
Cr-Commit-Position: refs/heads/main@{#928471}

chrome/browser/metrics/structured/BUILD.gn

@@ -18,6 +18,7 @@ static_library("structured") {
     "//build:chromeos_buildflags",
     "//chromeos/crosapi/mojom",
     "//components/metrics/structured",
+    "//components/metrics/structured:structured_events",
   ]
 
   if (is_chromeos_ash) {

chrome/browser/metrics/structured/chrome_structured_metrics_recorder.cc

@@ -4,6 +4,8 @@
 
 #include "chrome/browser/metrics/structured/chrome_structured_metrics_recorder.h"
 
+#include <stdint.h>
+
 #include "base/feature_list.h"
 #include "build/chromeos_buildflags.h"
 #include "components/metrics/structured/histogram_util.h"
@@ -19,6 +21,23 @@
 #endif
 namespace metrics {
 namespace structured {
+namespace {
+
+// Platforms for which the StructuredMetricsClient will be initialized for.
+enum class StructuredMetricsPlatform {
+  kUninitialized = 0,
+  kAshChrome = 1,
+  kLacrosChrome = 2,
+};
+
+// Logs initialization of Structured Metrics as a record.
+void LogInitializationInStructuredMetrics(StructuredMetricsPlatform platform) {
+  events::v2::structured_metrics::Initialization()
+      .SetPlatform(static_cast<int64_t>(platform))
+      .Record();
+}
+
+}  // namespace
 
 ChromeStructuredMetricsRecorder::ChromeStructuredMetricsRecorder() {
 // TODO(jongahn): Make a static factory class and pass it into ctor.
@@ -53,6 +72,7 @@ void ChromeStructuredMetricsRecorder::Initialize() {
   auto* ash_recorder =
       static_cast<AshStructuredMetricsRecorder*>(delegate_.get());
   ash_recorder->Initialize();
+  LogInitializationInStructuredMetrics(StructuredMetricsPlatform::kAshChrome);
 
 #elif BUILDFLAG(IS_CHROMEOS_LACROS)
   // Should only be enabled on Lacros if feature is enabled.
@@ -66,6 +86,12 @@ void ChromeStructuredMetricsRecorder::Initialize() {
     // Ensure that the sequence is the ui thread.
     DCHECK(is_current_ui_thread_set);
     lacros_recorder->SetSequence(base::SequencedTaskRunnerHandle::Get());
+    LogClientInitializationSuccessful(true);
+    LogInitializationInStructuredMetrics(
+        StructuredMetricsPlatform::kLacrosChrome);
+  } else {
+    LogInitializationInStructuredMetrics(
+        StructuredMetricsPlatform::kUninitialized);
   }
 #endif
 }

chrome/browser/metrics/structured/chrome_structured_metrics_recorder.h

@@ -11,13 +11,14 @@
 #include "components/metrics/structured/event.h"
 #include "components/metrics/structured/event_base.h"
 #include "components/metrics/structured/structured_metrics_client.h"
+#include "components/metrics/structured/structured_mojo_events.h"
 
 namespace metrics {
 namespace structured {
 
 namespace {
 using RecordingDelegate = StructuredMetricsClient::RecordingDelegate;
-}
+}  // namespace
 
 // Singleton to record structured metrics on Chrome.
 //

tools/metrics/structured/structured.xml

@@ -378,6 +378,31 @@
   </event>
 </project>
 
+<project name="StructuredMetrics">
+  <owner>[email protected]</owner>
+  <owner>[email protected]</owner>
+  <id>per-project</id>
+  <scope>device</scope>
+  <summary>
+    Structured Metrics is a logging framework for events. This project is used
+    for monitoring the framework itself.
+  </summary>
+
+  <event name="Initialization">
+    <summary>
+      Records metadata about initialization of Structured Metrics and will be
+      recorded immediately after initialization is successful. Will be sent once
+      per initialization during browser process initialization.
+    </summary>
+    <metric name="Platform" type="int">
+      <summary>
+        The platform for which the client is initialized on. 0: Uninitialized, 1:
+        ASH_CHROME, 2: LACROS_CHROME.
+      </summary>
+    </metric>
+  </event>
+</project>
+
 <project name="TestProjectOne">
   <owner>[email protected]</owner>
   <id>per-project</id>