Incident with Issues and Pull Requests Search
This summary is created by Generative AI and may differ from the actual content.
Overview
Search service for Issues and Pull Requests experienced degraded performance, resulting in 3.5% of search requests being rejected, between 21:01 UTC and 21:30 UTC on February 23, 2026.
Impact
3.5% of search requests for Issues and Pull Requests were rejected, and updates to Issues and Pull Requests may not have been immediately reflected in search results.
Trigger
A spike in internal traffic due to a configuration change in the search index during a routine migration.
Detection
The team was alerted to the increase in traffic as well as the increase in error rates.
Resolution
The team rolled back to the previous stable index.
Root Cause
The root cause of the incident is not explicitly stated in the postmortem, but it appears to be related to the configuration change in the search index during the routine migration.