Post Incident Review (PIR) – Azure OpenAI – GPT-5.2 availability degradation in 7 regions

Customer impact began, triggered by the recent service update.

We detected the issue via service monitoring. This prompted us to begin our investigation, engage with other teams to troubleshoot, and start developing a hot fix.

We determined that a rollback could mitigate more quickly than hotfix, so started the rollback for the impacted model.

Traffic routes were determined to be using incomplete data, due to the aforementioned dependency issue.

We identified and investigated resource constraints.

Rollback actions completed across all affected regions.

Full capacity information was restored across regions, traffic distribution normalized.

Once monitoring confirmed stable recovery, we determined the service was fully restored and all customer impact had been mitigated.