From 360dece7ad72cbe6f07acc8b14a1eade8fd35152 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C5=81ukasz=20Mierzwa?= <l.mierzwa@gmail.com>
Date: Fri, 30 Jun 2017 19:49:47 -0700
Subject: [PATCH] Disallow multiple Alertmanager instances with the same URI

Unique uri is required for silence form result tracking
---
 alertmanager/upstream.go | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/alertmanager/upstream.go b/alertmanager/upstream.go
index 178a70eee..4f18aa3f0 100644
--- a/alertmanager/upstream.go
+++ b/alertmanager/upstream.go
@@ -21,6 +21,12 @@ func NewAlertmanager(name, uri string, timeout time.Duration) error {
 		return fmt.Errorf("Alertmanager upstream '%s' already exist", name)
 	}
 
+	for _, am := range upstreams {
+		if am.URI == uri {
+			return fmt.Errorf("Alertmanager upstream '%s' already collects from '%s'", am.Name, am.URI)
+		}
+	}
+
 	// initialize metrics
 	metricAlertmanagerErrors.With(prometheus.Labels{
 		"alertmanager": name,