EventSource/WebHook - Service annotations

[pburgisser]

Is your feature request related to a problem? Please describe.
On GKE with Application LoadBalancer, when exposing a webhook a HTTP healthcheck is automatically created and points to the service port (for example 12000) on path /. The checks fail as the probe is on /health. We can override the path to user by creating a backendconfig. However, we need to reference that backendconfig in the service's annotations.

Documentation of the EventSource shows that we can't inject custom annotations

Describe the solution you'd like
In the service's part of the EventSource, we should be able to add annotations.

Describe alternatives you've considered
Creating (and "duplicating") a service that points to the webhook pod with the annotations

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Message from the maintainers:

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[MenD32]

I have also experienced this issue, a quick fix is to define the BackendConfig in the GCP console but it'd be very nice to have it work out-of-the-box in k8s

[MenD32]

i opened a PR since this change can be pretty easy to implement