Bug 1875515 - record Nimbus is_ready event (backport #5222) (#5268)

(cherry picked from commit 3b2bd69f8ebfdc4b74af71162636a75967ed6556)

Co-authored-by: Charlie <chumphreys@mozilla.com>

app/nimbus.fml.yaml

@@ -371,6 +371,17 @@ features:
       - channel: nightly
         value:
           enabled: true
+
+  nimbus-is-ready:
+    description: >
+      A feature that provides the number of Nimbus is_ready events to send
+      when Nimbus finishes launching.
+    variables:
+      event-count:
+        description: The number of events that should be sent.
+        type: Int
+        default: 1
+
 types:
   objects: {}
 

app/src/main/java/org/mozilla/fenix/experiments/NimbusSetup.kt

@@ -70,7 +70,9 @@ fun createNimbus(context: Context, urlString: String?): NimbusApi {
         onFetchCallback = {
             context.settings().nimbusExperimentsFetched = true
         }
-    }.build(appInfo)
+    }.build(appInfo).also { nimbusApi ->
+        nimbusApi.recordIsReady(FxNimbus.features.nimbusIsReady.value().eventCount)
+    }
 }
 
 private fun Context.reportError(message: String, e: Throwable) {