feat(metrics): rate-limit snapshot cache metrics on shared hosts#108
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khaile merged 3 commits intoJul 3, 2026
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…-112) Add rate-limiting infrastructure to snapshot cache metrics (capsule_snapshot_cache_hits, capsule_snapshot_cache_misses, capsule_snapshot_eviction_count, capsule_snapshot_eviction_bytes) when the host is configured for shared multi-tenancy. Changes: - Add set_metric_redaction/is_metric_redaction_enabled to capsule-core - Add rate-limited record_snapshot_cache_hit/miss/eviction functions using parking_lot::Mutex (no poisoning, faster fast path) - Wire up metric emission in TieredCacheManager::lookup and evict - Connect host-agent shared_host_metric_redaction flag to capsule-core - Document host-level aggregation limitation (tenant context not yet available in the cache tiering layer) On dedicated-tenancy hosts, full per-host granularity is maintained. On shared hosts, metrics are rate-limited to 60s intervals per key. Closes CAP-112
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Update AGENTS.md with guidelines for hashbrown and parking_lot.
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Summary
Implements SC-IMPL-04 (CAP-112): Rate-limit snapshot cache metrics on shared hosts.
Changes
set_metric_redaction/is_metric_redaction_enabledtocapsule-coremetrics modulerecord_snapshot_cache_hit,record_snapshot_cache_miss,record_snapshot_evictionfunctionsTieredCacheManager::lookup()(hits/misses) andCacheTierStore::evict()(evictions)shared_host_metric_redactionflag to capsule-core metricsBehavior
tenant_idlabel when availableMetrics affected
capsule_snapshot_cache_hitscapsule_snapshot_cache_missescapsule_snapshot_eviction_countcapsule_snapshot_eviction_bytesTesting
cargo clippy --all-targets --all-features --locked -- -D warningspassesCloses CAP-112