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Partial Resolved

Increased latency

Oct 6 · 05:45 UTC Affected Web App Duration 27 min
05:45 UTC
+0 min
Investigating

We are investigating elevated latency on Web App. Requests are completing, but slower than usual.

05:53 UTC
+8 min
Identified

The slowdown has been traced to a database query introduced in the latest deploy.

06:02 UTC
+17 min
Monitoring

A fix has been deployed and latency is returning to baseline. We are monitoring.

06:12 UTC
+27 min
Resolved

Latency has been back at baseline for 15 minutes. The incident is resolved.

Root cause

A new query in the latest deploy was missing an index and scanned a large table on every request. The index has been added and query plans are now checked in CI.