Add platform information for push notification metrics (#27460)

* Add platform information for push notification metrics

* Address feedback

* Add the client platform returned by the devices to the normalize function

* Add "no platform" platform label to distinguish from unknown

server/channels/api4/system.go

@@ -673,13 +673,13 @@ func pushNotificationAck(c *Context, w http.ResponseWriter, r *http.Request) {
 	}
 
 	if ack.NotificationType == model.PushTypeMessage {
-		c.App.CountNotificationAck(model.NotificationTypePush)
+		c.App.CountNotificationAck(model.NotificationTypePush, ack.ClientPlatform)
 	}
 
 	err := c.App.SendAckToPushProxy(&ack)
 	if ack.IsIdLoaded {
 		if err != nil {
-			c.App.CountNotificationReason(model.NotificationStatusError, model.NotificationTypePush, model.NotificationReasonPushProxySendError)
+			c.App.CountNotificationReason(model.NotificationStatusError, model.NotificationTypePush, model.NotificationReasonPushProxySendError, ack.ClientPlatform)
 			c.App.NotificationsLog().Error("Notification ack not sent to push proxy",
 				mlog.String("type", model.NotificationTypePush),
 				mlog.String("status", model.NotificationStatusError),
@@ -693,7 +693,7 @@ func pushNotificationAck(c *Context, w http.ResponseWriter, r *http.Request) {
 				mlog.Err(err),
 			)
 		} else {
-			c.App.CountNotificationReason(model.NotificationStatusSuccess, model.NotificationTypePush, model.NotificationReason(""))
+			c.App.CountNotificationReason(model.NotificationStatusSuccess, model.NotificationTypePush, model.NotificationReason(""), ack.ClientPlatform)
 		}
 		// Return post data only when PostId is passed.
 		if ack.PostId != "" && ack.NotificationType == model.PushTypeMessage {
@@ -725,7 +725,7 @@ func pushNotificationAck(c *Context, w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	c.App.CountNotificationReason(model.NotificationStatusSuccess, model.NotificationTypePush, model.NotificationReason(""))
+	c.App.CountNotificationReason(model.NotificationStatusSuccess, model.NotificationTypePush, model.NotificationReason(""), ack.ClientPlatform)
 	ReturnStatusOK(w)
 }