Bug 1226616 - The presence of the general.config.filename preference should be reported on telemetry. r=njn, data-review=francois

modules/libpref/Preferences.cpp

@@ -3255,6 +3255,8 @@ Preferences::GetInstanceForService()
     nsresult rv = Preferences::GetCString(
       "general.config.filename", lockFileName, PrefValueKind::User);
     if (NS_SUCCEEDED(rv)) {
+      Telemetry::ScalarSet(Telemetry::ScalarID::GENERAL_AUTOCONFIG_HAS_FILENAME,
+                           true);
       NS_CreateServicesFromCategory(
         "pref-config-startup",
         static_cast<nsISupports*>(static_cast<void*>(sPreferences)),

toolkit/components/telemetry/Scalars.yaml

@@ -442,6 +442,21 @@ storage.sync.api.usage:
     record_in_processes:
       - main
 
+general.autoconfig:
+  has_filename:
+    bug_numbers:
+      - 1226616
+    description: >
+      Recorded on startup. Boolean stating whether the
+      general.autoconfig.filename preference has a value.
+    expires: never
+    kind: boolean
+    notification_emails:
+      - florian@mozilla.com
+    release_channel_collection: opt-out
+    record_in_processes:
+      - 'main'
+
 services.sync:
   fxa_verification_method:
     bug_numbers: