Ilia Denisov
00bb66ba0f
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The edge request-latency histogram records seconds but used the OTel SDK's default millisecond-calibrated bucket boundaries (first boundary 5), so every sub-5s request fell into one bucket and histogram_quantile(0.99) interpolated to ~4.95s for every message type — regardless of the real (millisecond) latency. That tripped the >1s "Gateway request latency p99 high" alert on essentially every request, flapping fire/resolve on each app open (seen on the test and prod contours). Set explicit second-scale bucket boundaries (0.005 … 10s) straddling the 1s SLO so the p99 reflects real latency and the alert fires only on genuine slowness. Regression test asserts the histogram carries a sub-second boundary.