DDR Doc

https://docs.google.com/document/d/1zuH32s-pmnbw8cuTC5pFeMGb0uCP0vCBDt42djoAXSg/edit?usp=sharing

Epic Goal

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Why is this important?

Metrics collection is the current feature of ACM-Observability, the new addon needs to consider existing features

Scenarios

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Acceptance Criteria

• MUST Users can specify downsampling for metrics collection (from raw scrape up to 5 mins)
• MUST Users can view and modify the allowlist of metrics sent from spokes to the hub Thanos
• MUST Users can add recording rules that are evaluated in the spoke metrics stack
• MUST Users get a k8s native metrics collection stack if the spoke is non-OCP (prometheus-operator, kube-state metrics, node-exporter)
• MUST Users can configure the CMO OCP stack if the spoke is OCP  
• COULD support dynamic collection of metrics based on CPU/Memory triggers in the spoke cluster (telco) 
• The metrics-collection stack deployed to the spoke reports its addon status to the hub correctly
• Users are able to configure metrics-collection via a top-level CRD in MCOA

Alert-forwarding is not in-scope for this epic, that is being tracked through ACM-12472 

Dependencies (internal and external)

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Previous Work (Optional):

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Open questions:

1. Could this be derived from the CMO CRD for how it is configured? https://drive.google.com/file/d/1o6wpi99zU4mqbQEPzDlEH94GWrDv6z1p/view 

Done Checklist

• CI - CI is running, tests are automated and merged.
• Release Enablement <link to Feature Enablement Presentation>
• DEV - Upstream code and tests merged: <link to meaningful PR or GitHub
  Issue>
• DEV - Upstream documentation merged: <link to meaningful PR or GitHub
  Issue>
• DEV - Downstream build attached to advisory: <link to errata>
• QE - Test plans in Polarion: <link or reference to Polarion>
• QE - Automated tests merged: <link or reference to automated tests>
• DOC - Doc issue opened with a completed template. Separate doc issue
  opened for any deprecation, removal, or any current known
  issue/troubleshooting removal from the doc, if applicable.