add channel option to disable the resolved alert (OK Message) that is sent when condition returns to normal.

pkg/services/alerting/notifiers/base.go

@@ -21,6 +21,7 @@ type NotifierBase struct {
 	IsDeault     bool
 	UploadImage  bool
 	SendReminder bool
+	DisableResolvedMessage    bool
 	Frequency    time.Duration
 
 	log log.Logger
@@ -34,14 +35,15 @@ func NewNotifierBase(model *models.AlertNotification) NotifierBase {
 	}
 
 	return NotifierBase{
-		Id:           model.Id,
-		Name:         model.Name,
-		IsDeault:     model.IsDefault,
-		Type:         model.Type,
-		UploadImage:  uploadImage,
-		SendReminder: model.SendReminder,
-		Frequency:    model.Frequency,
-		log:          log.New("alerting.notifier." + model.Name),
+		Id:           			model.Id,
+		Name:         			model.Name,
+		IsDeault:     			model.IsDefault,
+		Type:         			model.Type,
+		UploadImage:  			uploadImage,
+		SendReminder: 			model.SendReminder,
+		DisableResolvedMessage: model.DisableResolvedMessage,
+		Frequency:    			model.Frequency,
+		log:          			log.New("alerting.notifier." + model.Name),
 	}
 }
 
@@ -83,6 +85,11 @@ func (n *NotifierBase) ShouldNotify(ctx context.Context, context *alerting.EvalC
 		}
 	}
 
+	// Do not notify when state is OK if DisableResolvedMessage is set to true
+	if context.Rule.State == models.AlertStateOK && n.DisableResolvedMessage {
+		return false
+	}
+
 	return true
 }
 
@@ -106,6 +113,10 @@ func (n *NotifierBase) GetSendReminder() bool {
 	return n.SendReminder
 }
 
+func (n *NotifierBase) GetDisableResolvedMessage() bool {
+	return n.DisableResolvedMessage
+}
+
 func (n *NotifierBase) GetFrequency() time.Duration {
 	return n.Frequency
 }