Bug 1837230 - Instrument an early event for FOG validation r=perry.mcmanis,nalexander

Differential Revision: https://phabricator.services.mozilla.com/D180364

browser/components/BrowserContentHandler.sys.mjs

@@ -1043,6 +1043,13 @@ nsDefaultCommandLineHandler.prototype = {
   handle: function dch_handle(cmdLine) {
     var urilist = [];
 
+    if (cmdLine && cmdLine.state == Ci.nsICommandLine.STATE_INITIAL_LAUNCH) {
+      // Since the purpose of this is to record early in startup,
+      // only record on launches, not already-running invocations.
+      Services.telemetry.setEventRecordingEnabled("telemetry", true);
+      Glean.fogValidation.validateEarlyEvent.record();
+    }
+
     if (AppConstants.platform == "win") {
       // Windows itself does disk I/O when the notification service is
       // initialized, so make sure that is lazy.

toolkit/components/glean/metrics.yaml

@@ -135,3 +135,15 @@ fog.ipc:
       - chutten@mozilla.com
       - glean-team@mozilla.com
     expires: never
+
+fog.validation:
+  validate_early_event:
+    type: event
+    description: |
+      An event sent very early to validate that FOG is able to process it.
+    bugs: ["https://bugzilla.mozilla.org/show_bug.cgi?id=1837230"]
+    data_reviews: ["https://bugzilla.mozilla.org/show_bug.cgi?id=1837230"]
+    data_sensitivity: ["interaction"]
+    notification_emails: ["chutten@mozilla.com"]
+    expires: 120
+    telemetry_mirror: Telemetry_EarlyEvent_Startup

toolkit/components/telemetry/Events.yaml

@@ -1630,6 +1630,16 @@ messaging_experiments:
       - omc@mozilla.com
     expiry_version: never
 
+telemetry:
+  early_event:
+    objects: ["startup"]
+    bug_numbers: [1837230]
+    notification_emails: ["chutten@mozilla.com"]
+    products: ["firefox"]
+    record_in_processes: ["main"]
+    description: This is a mirrored-to verification event.
+    expiry_version: "120"
+
 # This category contains event entries used for Telemetry tests.
 # They will not be sent out with any pings.
 telemetry.test: