Audit logging, tracing, and metrics pipelines for volume waste — debug-level logging in production, unsampled traces, high-cardinality metrics explosions, duplicate log shipping, and retention without tiers. Use this skill whenever the user shares logging configs (log4j/logback/zap, OpenTelemetry, Prometheus, Datadog/Splunk settings), complains about observability costs, or wants a telemetry efficiency review. Part of Lean Agentic AI Skills; emits lean-findings.json.
