KIP-1257 — Partition Size Percentage Metrics for Storage Monitoring

Accepted Kafka 4.3 MetricsBroker

Adds partition-level storage utilization percentage metrics that express current log size as a fraction of configured retention limits (both size-based and time-based local retention, and remote retention for tiered storage). Operators must currently compute these percentages manually by correlating size metrics with retention configs, and the calculation is especially complex for tiered topics with separate local/remote retention constraints.

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