Feature Overview (aka. Goal Summary)  

Enable Hosted Control Planes for the ARO/HCP Managed OpenShift offering.

Goals (aka. expected user outcomes)

Support Hosted Clusters NodePool ability to scale down to zero replicas and successfully scale back up.

Requirements (aka. Acceptance Criteria):

The functionality must work across all supported releases of ARO/HCP.

Anyone reviewing this Feature needs to know which deployment configurations that the Feature will apply to (or not) once it's been completed.  Describe specific needs (or indicate N/A) for each of the following deployment scenarios. For specific configurations that are out-of-scope for a given release, ensure you provide the OCPSTRAT (for the future to be supported configuration) as well.

Use Cases:

Allow Hosted Cluster admins to scale to zero node pools which is similar to pausing the cluster for workload purposes.

Allow ARO/HCP Cluster Lifecycle SRE to scale down to zero when NodePools run versions affected by vulnerabilities or out of support. 

Out of Scope

Self-managed Azure support is out of scope (but can be a stretch goal)

Background

Follows up on the work done in OCPSTRAT-1525

Customer Considerations

Provide any additional customer-specific considerations that must be made when designing and delivering the Feature.  Initial completion during Refinement status.

Needs to be coordinated with ARO/HCP for HCMSTRAT-6

Documentation Considerations

Support needs to be documented API wise in upstream documentation.

Interoperability Considerations

ARO/HCP