Disable legacy GKE prometheus instances
What
Disables legacy GKE prometheus instances for gprd
, ops
, gstg
.
Why
When we migrated to Mimir we moved to using new prometheus agent instances.
Now that the migration is completed we are decommissioning the old instances.
Change Request: gitlab-com/gl-infra/production#18224 (closed) Related Issue: gitlab-com/gl-infra/scalability#3564 (closed)