return failure with CH class hits file or etcd, monitoring portis 9135

middleware/prometheus/README.md

@@ -25,6 +25,6 @@ prometheus
 For each zone that you want to see metrics for.
 
 It optionally takes an address where the metrics are exported, the default
-is `localhost:9153`. The metrics path is fixed to `/metrics`.
+is `localhost:9154`. The metrics path is fixed to `/metrics`.
 
 ## Examples

middleware/prometheus/metrics.go

@@ -39,6 +39,7 @@ func (m *Metrics) Start() error {
 
 		http.Handle(path, prometheus.Handler())
 		go func() {
+			// TODO(miek): Logging here?
 			fmt.Errorf("%s", http.ListenAndServe(m.Addr, nil))
 		}()
 	})