adding prometheus

cmd/botkube/main.go

@@ -2,11 +2,11 @@ package main
 
 import (
 	"fmt"
-
 	"github.com/infracloudio/botkube/pkg/bot"
 	"github.com/infracloudio/botkube/pkg/config"
 	"github.com/infracloudio/botkube/pkg/controller"
 	log "github.com/infracloudio/botkube/pkg/logging"
+	"github.com/infracloudio/botkube/pkg/metrics"
 	"github.com/infracloudio/botkube/pkg/notify"
 	"github.com/infracloudio/botkube/pkg/utils"
 )
@@ -30,6 +30,9 @@ func main() {
 		go mb.Start()
 	}
 
+	//Prometheus metrics
+	go metrics.ServeMetrics()
+
 	// List notifiers
 	var notifiers []notify.Notifier
 	if Config.Communications.Slack.Enabled {

go.mod

@@ -31,7 +31,7 @@ require (
 	github.com/onsi/ginkgo v1.10.2 // indirect
 	github.com/pborman/uuid v1.2.0 // indirect
 	github.com/pelletier/go-toml v1.5.0 // indirect
-	github.com/pkg/errors v0.8.1 // indirect
+	github.com/prometheus/client_golang v1.2.1
 	github.com/sirupsen/logrus v1.4.2
 	github.com/spf13/pflag v1.0.5 // indirect
 	github.com/stretchr/objx v0.2.0 // indirect
@@ -42,7 +42,6 @@ require (
 	go.uber.org/zap v1.10.0 // indirect
 	golang.org/x/crypto v0.0.0-20191002192127-34f69633bfdc // indirect
 	golang.org/x/net v0.0.0-20191009170851-d66e71096ffb // indirect
-	golang.org/x/sys v0.0.0-20191009170203-06d7bd2c5f4f // indirect
 	golang.org/x/time v0.0.0-20190921001708-c4c64cad1fd0 // indirect
 	google.golang.org/appengine v1.6.5 // indirect
 	gopkg.in/asn1-ber.v1 v1.0.0-20181015200546-f715ec2f112d // indirect

helm/botkube/templates/service.yaml

@@ -0,0 +1,26 @@
+{{- if .Values.service }}
+{{- range $port := .Values.service.ports  }}
+{{- $service_type := $port.type | default "ClusterIP" }}
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ include "botkube.fullname" . }}
+  labels: 
+    app.kubernetes.io/name: {{ include "botkube.name" . }}
+    helm.sh/chart: {{ include "botkube.chart" . }}
+    app.kubernetes.io/instance: {{ .Release.Name }}
+    app.kubernetes.io/managed-by: {{ .Release.Service }}  
+    app: botkube
+spec:
+  type: {{ $service_type }}
+  ports:
+    - name: {{ $port.name }}
+      port: {{ $port.port }}
+      targetPort: {{ $port.port }}
+  selector:
+    matchLabels:
+      component: controller
+      app: botkube 
+  {{- end }}
+  {{- end }}

helm/botkube/templates/servicemonitor.yaml

@@ -0,0 +1,31 @@
+{{- if .Values.serviceMonitor.enabled }}
+apiVersion: monitoring.coreos.com/v1
+kind: ServiceMonitor
+metadata:
+  name: {{ template "botkube.fullname" . }}
+  labels:
+    app.kubernetes.io/name: {{ include "botkube.name" . }}
+    helm.sh/chart: {{ include "botkube.chart" . }}
+    app.kubernetes.io/instance: {{ .Release.Name }}
+    app.kubernetes.io/managed-by: {{ .Release.Service }}
+    component: controller
+    app: botkube-sm
+    release: prom
+
+spec:
+  endpoints:
+  - interval: {{ .Values.serviceMonitor.interval }}
+    port: {{ .Values.serviceMonitor.port }}
+    path: {{ .Values.serviceMonitor.path }}
+  selector:
+    matchLabels:
+      app.kubernetes.io/name: {{ include "botkube.name" . }}
+      helm.sh/chart: {{ include "botkube.chart" . }}
+      app.kubernetes.io/instance: {{ .Release.Name }}
+      app.kubernetes.io/managed-by: {{ .Release.Service }}
+      component: controller
+      app: botkube
+  namespaceSelector:
+    matchNames:
+      - {{ .Release.Namespace }}
+{{- end }}

helm/botkube/values.yaml

@@ -250,6 +250,23 @@ config:
     # Set false to disable upgrade notification
     upgradeNotifier: true
 
+service: {}
+  # ports:
+  #   - name: "metrics"
+  #     type: ClusterIP
+  #     port: 2112
+
+serviceMonitor:
+  ## If true, a ServiceMonitor CRD is created for a botkube
+  ## https://github.com/infracloudio/botkube
+  ##
+  enabled: false
+  interval: 10s
+  path: /metrics
+  port: 2112
+  labels: {}
+
+
 resources: {}
   # We usually recommend not to specify default resources and to leave this as a conscious
   # choice for the user. This also increases chances charts run on environments with little

pkg/metrics/metrics.go

@@ -0,0 +1,12 @@
+package metrics
+
+import (
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+	"net/http"
+)
+
+// ServeMetrics expose metrics
+func ServeMetrics() {
+	http.Handle("/metrics", promhttp.Handler())
+	http.ListenAndServe(":2112", nil)
+}