Support for managed prometheus configuration on GKE clusters.

[stewartshea]

What problem are you facing?

This is a feature request to add support for the managed prometheus capability in the Cluster resource. Though, it might make sense to support a field that could take arbitrary input (such as extraArgs often seen in helm values files) as a faster way to allow users to consume new features released by Google and supported here: https://cloud.google.com/kubernetes-engine/docs/reference/rest/v1/projects.locations.clusters#Cluster

Ultimately, this issue is largely about enabling the ability to toggle on managed prometheus for cluster objects. I would suspect the yaml might look like the following... though we could look at other examples that have implemented this (e.g. terraform) for inspiration.

    monitoringConfig: 
      managedPrometheusConfig: 
        enabled: true

How could Crossplane help solve your problem?

I currently use Crossplane to build many of our clusters and related objects, but use Terraform and Flux where crossplane is slower on the support of a provided feature. In this case, flux is used to install GMP, but this is a post-install activity that can cause some challenges and we suspect that enabling the feature may be less error prone than managing and updating post-deployment configuration manifests.

Thanks for your time and effort reading this, and for crossplane and the crossplane-gcp support in general!