From 6bbac65f7e6ae28fb34805f364b2bd97d5b53859 Mon Sep 17 00:00:00 2001
From: Andrew Bruce <me@andrewbruce.net>
Date: Wed, 22 Aug 2018 15:08:03 +0100
Subject: [PATCH] Include missing key in error message for KV store

---
 cluster/datastore.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cluster/datastore.go b/cluster/datastore.go
index 081c1f5f2..168745e27 100644
--- a/cluster/datastore.go
+++ b/cluster/datastore.go
@@ -78,7 +78,7 @@ func (d *Datastore) watchChanges() error {
 	stopCh := make(chan struct{})
 	kvCh, err := d.kv.Watch(d.lockKey, stopCh, nil)
 	if err != nil {
-		return err
+		return fmt.Errorf("error while watching key %s: %v", d.lockKey, err)
 	}
 	safe.Go(func() {
 		ctx, cancel := context.WithCancel(d.ctx)