Optimize client stats collection#2270
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Replace stream grouping in client stats snapshots with explicit per-host counters to avoid redundant collector passes when metrics are scraped frequently. Count idle pooled channels with direct partition iteration while preserving existing host filtering and tombstone skipping behavior. Add coverage for idle per-host counts so claimed channels are not reported as leasable. Codex on behalf of Pavel Ptashyts Co-Authored-By: Codex <codex@openai.com>
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Summary
ChannelManager.getClientStats()with explicit per-host counters.Validation
./mvnw -pl client -Dtest=DefaultChannelPoolTest,ClientStatsTest test./mvnw -pl client -DskipTests -Dgpg.skip=true verifygit diff --checkAttribution
Codex on behalf of Pavel Ptashyts