docs: add OpenSpec change for downscale improvements#253
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Adds the design artifacts for the kafka cluster downscale improvement initiative, covering two related fixes: 1. Batched broker removal - submit all brokers removed in a single manifest apply as one CC remove_broker operation instead of N separate operations, eliminating redundant partition movements. 2. Draining broker listener retention - keep brokers removed from spec in envoy/istio/contour config until CruiseControl completes draining (GracefulDownscaleSucceeded), preserving client connectivity. Artifacts: proposal, design, capability specs, and implementation tasks. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Adds the design artifacts for the kafka cluster downscale improvement initiative, covering two related fixes:
Batched broker removal - submit all brokers removed in a single manifest apply as one CC remove_broker operation instead of N separate operations, eliminating redundant partition movements.
Draining broker listener retention - keep brokers removed from spec in envoy/istio/contour config until CruiseControl completes draining (GracefulDownscaleSucceeded), preserving client connectivity.
Artifacts: proposal, design, capability specs, and implementation tasks.
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