Configure router deployment replicas (#2782)

charts/fission-all/templates/router/deployment.yaml

@@ -12,7 +12,7 @@ metadata:
     application: fission-router
 spec:
 {{- if not .Values.router.deployAsDaemonSet }}
-  replicas: 1
+  replicas: {{ .Values.router.replicas | default 1 }}
 {{- end }}
   selector:
     matchLabels:

charts/fission-all/values.yaml

@@ -211,6 +211,9 @@ router:
   ## deployAsDaemonSet decides whether to deploy router as a DaemonSet or a Deployment.
   ##
   deployAsDaemonSet: false
+  ## replicas decides how many router pods to deploy. Only used when deployAsDaemonSet is false.
+  ##
+  replicas: 1
   ## svcAddressMaxRetries is the max times for router to retry with a specific function service address
   ##
   svcAddressMaxRetries: 5