Support placement groups for elastic fleets #3282
Merged
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Closes #3256
Previously, placement groups were created and used for instances provisioned for static cloud fleets (with
nodes: n). This PR adds placement group support for any instances provisioned in cluster fleets. It repeats placement group logic from create_instance in process_submitted_jobs. Also fixes several fleet-related bugs introduced in previous PRs.Important: Provisioning even one instance in a cluster fleet (e.g. for a dev env) now creates a placement group for that instance since more instances can be provisioned later due to fleet elasticity and all the instances should be in the placement group.