Linkerd route-based metrics do not work with GKE default ingress controller

Question

I have a microservice running in GKE. I am trying to befriend default GKE GCE-ingress with linkerd so that I can observe route-based metrics with linkerd. The documentation says that the GCE ingress should be meshed with ingress mode enabled, i.e. with the linkerd.io/inject: ingress annotation rather than the default enabled. I tried the following Ingress resource, however route-based metrics are not coming. I checked with linked tap command and rt_route is not getting set.

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: web-ingress
  namespace: emojivoto
  annotations:
    ingress.kubernetes.io/custom-request-headers: "l5d-dst-override: web-svc.emojivoto.svc.cluster.local:80"
    ingress.gcp.kubernetes.io/pre-shared-cert: "managed-cert-name"
    kubernetes.io/ingress.global-static-ip-name: "static-ip-name"
    linkerd.io/inject: ingress
spec:
  ingressClassName: gce
  rules:
  - host: example.com
    http:
      paths:
      - path: /
        pathType: Prefix
        backend:
          service:
            name: web-svc
            port:
              number: 80

I suspect that linkerd.io/inject: ingress annotation should be added to ingress controller, however since it is managed by GKE, I do not know how I can add it.

Answer 1

The linkerd.io/inject: ingress annotation should be added to your deployment(s) or to one or more namespace for automatic injection.