Merge pull request #9 from cosminrentea/feature/prometheus-basic-metrics

First Prometheus metric - for APNS

server/apns/apns.go

@@ -119,6 +119,7 @@ func (a *apns) HandleResponse(request connector.Request, responseIface interface
 	if r.Sent() {
 		logger.WithField("id", r.ApnsID).Info("APNS notification was successfully sent")
 		mTotalSentMessages.Add(1)
+		pSentMessages.Inc()
 		if *a.IntervalMetrics && metadata != nil {
 			addToLatenciesAndCountsMaps(currentTotalMessagesLatenciesKey, currentTotalMessagesKey, metadata.Latency)
 		}

server/apns/apns_prometheus.go

@@ -0,0 +1,18 @@
+package apns
+
+import (
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+var (
+	pSentMessages = prometheus.NewCounter(prometheus.CounterOpts{
+		Name: "apns_sent_messages",
+		Help: "Number of messages sent to APNS",
+	})
+)
+
+func init() {
+	prometheus.MustRegister(
+		pSentMessages,
+	)
+}