[MM-53195] services/telemetry: regen client config right after assigning diagnostic ID to platform (#23773)

server/channels/app/platform/service.go

@@ -381,6 +381,13 @@ func (ps *PlatformService) ShutdownConfig() error {
 
 func (ps *PlatformService) SetTelemetryId(id string) {
 	ps.telemetryId = id
+
+	ps.PostTelemetryIdHook()
+}
+
+// PostTelemetryIdHook triggers necessary events to propagate telemtery ID
+func (ps *PlatformService) PostTelemetryIdHook() {
+	ps.regenerateClientConfig()
 }
 
 func (ps *PlatformService) SetLogger(logger *mlog.Logger) {

server/channels/app/platform/service_test.go

@@ -168,3 +168,19 @@ func TestShutdown(t *testing.T) {
 		require.Zero(t, atomic.LoadInt32(&th.Service.goroutineCount))
 	})
 }
+
+func TestSetTelemetryId(t *testing.T) {
+	t.Run("ensure client config is regenerated after setting the telemetry id", func(t *testing.T) {
+		th := Setup(t)
+		defer th.TearDown()
+
+		clientConfig := th.Service.LimitedClientConfig()
+		require.Empty(t, clientConfig["DiagnosticId"])
+
+		id := model.NewId()
+		th.Service.SetTelemetryId(id)
+
+		clientConfig = th.Service.LimitedClientConfig()
+		require.Equal(t, clientConfig["DiagnosticId"], id)
+	})
+}