Feature Overview (aka. Goal Summary)  

Deprecation/Warning message (not removal) when applications use service-ca annotations for user namespaces, services and workloads. The deprecation message should encourage users to adopt cert-manager for certificate management for their workloads.

Goals (aka. expected user outcomes)

Align with guidance on the use of service-ca:

• https://docs.google.com/document/d/1M6hHidJ06aqZLBq-TXP81BXYZKjnS_dyI9ORzTXzTzU/edit?usp=sharing 
• Identify gaps that might be preventing users from adopting cert-manager
• Provide a path for certificate management for user workloads with modern capabilities and aligned with an upstream community
• Maintain and restrict service-ca as a solution for OCP core components

Requirements (aka. Acceptance Criteria):

• Capability should remain operational for user workloads (it is only a deprecation message, not a removal message)

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 (Optional):

Include use case diagrams, main success scenarios, alternative flow scenarios.  Initial completion during Refinement status.

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Questions to Answer (Optional):

Include a list of refinement / architectural questions that may need to be answered before coding can begin.  Initial completion during Refinement status.

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Out of Scope

High-level list of items that are out of scope.  Initial completion during Refinement status.

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Background

Provide any additional context is needed to frame the feature.  Initial completion during Refinement status.

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Customer Considerations

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

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Documentation Considerations

Provide information that needs to be considered and planned so that documentation will meet customer needs.  If the feature extends existing functionality, provide a link to its current documentation. Initial completion during Refinement status.

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Interoperability Considerations

Which other projects, including ROSA/OSD/ARO, and versions in our portfolio does this feature impact?  What interoperability test scenarios should be factored by the layered products?  Initial completion during Refinement status.

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