Memory-efficiency pass on ClientStatsAggregator + adversarial benchmark#11389

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dougqh wants to merge 14 commits into

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dougqh/metrics-memory-efficiency

Commits on May 18, 2026

Fold AggregateMetric into AggregateEntry

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Store peer tags as UTF8BytesString[] instead of List on AggregateEntry

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Add miss-path JMH benchmark for ClientStatsAggregator

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Back cardinality handlers with flat open-addressed tables

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Lazy-allocate the error latency histogram on AggregateEntry

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Raise per-field cardinality limits to match real workloads

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Add end-to-end JMH benchmark for the trace pipeline

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Add adversarial JMH benchmark targeting the metrics subsystem

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Document adversarial-case behavior in client metrics design doc

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