Hermes-Memory-Installer Team Documents Stale Cache Severity Levels in Architecture Record

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The team behind hermes-memory-installer has formally documented how it classifies stale entries in gbrain, its in-process memory metadata cache, via a commit added on April 7, 2025. The decision record, stored in the docs/architecture/ directory, defines three severity tiers — low, medium, and high — based on how critical the code path is that reads the stale metadata. Real incident data drove the classification: medium-severity stale entries had triggered 12% of gbrain eviction loops under load, while high-severity cases caused two production outages in Q1 2025. High-severity events now trigger a fatal error and a systemd watchdog reset, while medium-severity ones prompt a warning and an automatic invalidation retry. The move aims to prevent recurring ambiguity across pull requests and team discussions by giving all future contributors a single authoritative reference for stale-entry handling.

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