Add Hostname to HealthCheckConfig

[AngellusMortis]

Reopen #1046

The docs say the request host header will be set if it is in the pod containers spec.

Request Host header | Host: backend-ip-address | if present in the serving Pod's spec: containers[].readinessProbe.httpGet.httpHeaders

The issue is that this creates a race condition when first creating an ingress if it is created before the pods are deployed (i.e. via Helm). This means if you are deploying an application with strict hostname checking (i.e. Django), your ingress/load balancers will never become healthly unless you delete the ingress and re-add it after the initial deploy.

So it would be nice to actually be able to configure the hostname for the healthcheck as defined in the healthchecks REST API reference

Something like:

apiVersion: cloud.google.com/v1
kind: BackendConfig
metadata:
  name: service-backend-config
spec:
  healthCheck:
    requestPath: /healthcheck/
    host: example.com

[ghost]

I also need this. I don't always have control over what hostname deployment respond on. This is critical and I can do this in the console but not the BackendConfig. There's no technical reason why this couldn't be done.

[jasonwzm]

+1 for this as well.

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[AngellusMortis]

/remove-lifecycle stale

[swetharepakula]

/kind feature
/lifecycle frozen