From 777c1024c9d99658e9a025087074242efba87822 Mon Sep 17 00:00:00 2001
From: Corentin Chary <c.chary@criteo.com>
Date: Thu, 15 Mar 2018 10:07:22 +0100
Subject: [PATCH] alertmanager: if there are no alerts to send, do nothing

---
 pkg/services/alerting/notifiers/alertmanager.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/pkg/services/alerting/notifiers/alertmanager.go b/pkg/services/alerting/notifiers/alertmanager.go
index 08f8e8be29c..607a97d977c 100644
--- a/pkg/services/alerting/notifiers/alertmanager.go
+++ b/pkg/services/alerting/notifiers/alertmanager.go
@@ -78,6 +78,10 @@ func (this *AlertmanagerNotifier) Notify(evalContext *alerting.EvalContext) erro
 		alerts = append(alerts, alertJSON)
 	}
 
+	if len(alerts) == 0 {
+		return nil
+	}
+
 	bodyJSON := simplejson.NewFromAny(alerts)
 	body, _ := bodyJSON.MarshalJSON()