Change validate rule ignore non-default channels (#1680)

* change validate rule ignore non-default channels

* refactor code

---------
Co-authored-by: NshardingHe <wangzihe@flashcat.cloud>
Co-authored-by: NYening Qin <710leo@gmail.com>

center/router/router_alert_rule.go

@@ -305,6 +305,15 @@ func (rt *Router) alertRuleValidation(c *gin.Context) {
 		ancs := make([]string, 0, len(f.NotifyChannelsJSON)) //absent Notify Channels
 		for i := range f.NotifyChannelsJSON {
 			flag := true
+			//ignore non-default channels
+			switch f.NotifyChannelsJSON[i] {
+			case models.Dingtalk, models.Wecom, models.Feishu, models.Mm,
+				models.Telegram, models.Email, models.FeishuCard:
+				// do nothing
+			default:
+				continue
+			}
+			//default channels
 			for ui := range users {
 				if _, b := users[ui].ExtractToken(f.NotifyChannelsJSON[i]); b {
 					flag = false
@@ -317,7 +326,7 @@ func (rt *Router) alertRuleValidation(c *gin.Context) {
 		}
 
 		if len(ancs) > 0 {
-			ginx.NewRender(c).Message(i18n.Sprintf(c.GetHeader("X-Language"), "All users are missing notify channel configurations. Please check for missing tokens (each channel should be configured with at least one user). %s", ancs))
+			ginx.NewRender(c).Message("All users are missing notify channel configurations. Please check for missing tokens (each channel should be configured with at least one user). %s", ancs)
 			return
 		}