Graham McIntire
9bf96349ad
Three small wins from a telemetry audit: 1. Propagation.scores_at/3 wrapped every call in Instrument.span, firing two handler dispatches that dominated the ~10µs ETS lookup on cache hits. The map's LiveView fires this on every pan + point-click, so hot-path latency was mostly telemetry. Span now wraps only the miss branch (where disk IO makes the duration signal meaningful); hit path still emits the cheap hit/miss counter the cache-ratio panel reads. 2. Oban queue-depth poller: 10s → 30s. Every replica independently GROUP-BYs oban_jobs, so each extra replica paid ~3 redundant queries per minute for a gauge that moves on the hour-scale anyway. 3. Dropped summary(phoenix.endpoint.start.system_time): summarizing a wall-clock timestamp produces no useful aggregate — stop.duration below it is the meaningful signal. |
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