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Design doc: Jev-based Micrometer metric triage (jevmetrics-style JVM module) - #2

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jamilxt wants to merge 2 commits into
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design/micrometer-metric-triage

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@jamilxt

@jamilxt jamilxt commented Sep 23, 2026

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Design for a new typesafe-ai-java-micrometer module: in-process metric triage for Micrometer inspired by ishantanu/jevmetrics (OTel Collector processor). Annotate mode first (companion jev.metric.* gauges), reduce mode second (MeterFilter deny below keep threshold + protection allowlist), async assessment with bounded cache, Spring Boot auto-config in the starter. Review before coding.

@jamilxt

jamilxt commented Sep 23, 2026

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Status: PARKED by decision of Sep 23 2026, not merging. The design doc stands as the record of the evaluation. Summary of why we stopped: in-process vantage point cannot solve the fleet-level problem the cost framing requires; metadata inference is weaker evidence than usage-based retention (Grafana Adaptive Metrics); async fail-open vs startup registration blunts reduce mode; most meters belong to frameworks, not hand-written code, so the review surface is small. Revisit trigger: real metric-hygiene pain in a live project, or if we ever want the OTel Collector route where the vantage point actually fits. Branch kept for reference.

@jamilxt jamilxt closed this Sep 23, 2026
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