User Story

As a user I'd like to be warned when I'm setting up a Control Plane Machine Set for my control plane machines on GCP and I don't have the necessary TargetPools requirement for it to work correctly.

Background

We previously had a validating webhook on the CPMSO for GCP that would check if the control plane machine provider config set on the CPMS did have TargetPools, otherwise it would error.

This unfortunately collides with GCP Private clusters, see https://issues.redhat.com/browse/OCPBUGS-6760.

As such we decided to remove the check until warnings are supported in controller-runtime.
Once those land we can re-add the check and throw a warning in those situations, to still inform the user without disrupting normal operations where that's not an issue.

See:  https://redhat-internal.slack.com/archives/C68TNFWA2/p1675105892589279.

Webhook warnings available for 0.16.0 release of controller-runtime

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