What happened
Authentication latency on the EU path rose sharply from 09:12 UTC. Callers queued behind a saturated connection pool, and the pool was observed at capacity within two minutes of the first alert. [E_001, E_002]
Root cause
Connection-pool exhaustion on the EU authentication path. Latency tracked pool saturation exactly across every spike, and the hypothesis was confirmed in-channel at 09:19 UTC. [E_002, E_003]
Decisions taken
The incident lead resized the authentication pool to 250 and rolled the change immediately; the queue was observed draining in eu-west-1 shortly afterwards. [E_004, E_005]
Actions
A customer notice was recorded as approved by the service owner. This claim could not be traced to any message in the transcript and is reported as ungrounded rather than asserted — the approval may have happened outside the channel, in which case the evidence for it lives elsewhere.
- Data source
- Sealed transcript revision 3, captured from the incident channel
- Population
- All events captured between 09:08 and 09:41 UTC
- Hours basis
- UTC throughout
- Exclusions
- Bot messages and join/leave events
- Classification
- Internal
- Grounding
- 3 of 4 claims traced to source; 1 flagged ungrounded