GEP: GRPCRoute

[gnossen]

What would you like to be added:

A GRPCRoute resource for idiomatically routing gRPC traffic.

Why this is needed:

Full rationale detailed in the GEP.

[robscott]

/kind gep
/remove-kind feature

[k8s-triage-robot]

The Kubernetes project currently lacks enough contributors to adequately respond to all issues and PRs.

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• After 90d of inactivity, lifecycle/stale is applied
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You can:

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/lifecycle stale

[robscott]

/remove-lifecycle stale
/lifecycle frozen

[robscott]

Reopening this issue to track adding the following:

• Conformance Tests
• Documentation