[MM-57066][MM-57329] Added metrics for all notification stopping points, consolidated categories between metrics and logging (#26799)

* [MM-57066] Add metric counters for notification events

* Some small changes

* Account for Metrics() sometimes being nil

* Fix test (again)

* Fix more tests

* A few changes from testing - added success counter

* Missed a mock

* Lint

* Add feature flag for notification monitoring

server/channels/wsapi/system.go

@@ -26,14 +26,38 @@ func ping(req *model.WebSocketRequest) (map[string]any, *model.AppError) {
 func (api *API) websocketNotificationAck(req *model.WebSocketRequest) (map[string]any, *model.AppError) {
 	// Log the ACKs if necessary
 	api.App.NotificationsLog().Debug("Websocket notification acknowledgment",
-		mlog.String("type", model.TypeWebsocket),
+		mlog.String("type", model.NotificationTypeWebsocket),
 		mlog.String("user_id", req.Session.UserId),
 		mlog.Any("user_agent", req.Data["user_agent"]),
 		mlog.Any("post_id", req.Data["post_id"]),
-		mlog.Any("result", req.Data["result"]),
+		mlog.Any("status", req.Data["status"]),
 		mlog.Any("reason", req.Data["reason"]),
 		mlog.Any("data", req.Data["data"]),
 	)
 
+	// Count metrics for websocket acks
+	api.App.CountNotificationAck(model.NotificationTypeWebsocket)
+
+	status := req.Data["status"]
+	reason := req.Data["reason"]
+	if status == nil {
+		return nil, nil
+	}
+
+	notificationStatus := model.NotificationStatus(status.(string))
+	if reason == nil && notificationStatus != model.NotificationStatusSuccess {
+		return nil, nil
+	}
+	var notificationReason model.NotificationReason
+	if reason != nil {
+		notificationReason = model.NotificationReason(reason.(string))
+	}
+
+	api.App.CountNotificationReason(
+		notificationStatus,
+		model.NotificationTypeWebsocket,
+		notificationReason,
+	)
+
 	return nil, nil
 }