Degradation in repos contents API
On September 4, 2026, between approximately 21:45 and 22:07 UTC, some users experienced errors and elevated latency for repository operations. The incident was fully resolved at 22:23 UTC. The cause was a capacity change that spread one of our clusters across additional availability zones; our zone-aware traffic routing kept sending requests to the original zone for performance, overloading a small set of servers while the new capacity sat idle. We resolved the incident by reverting the change and letting traffic rebalance. We are improving per-zone capacity guarantees, cross-zone load-shedding, and pre-production testing of multi-zone changes to prevent recurrence.
The latest update from GitHub.
State
Resolved
Started
57 d ago
2026-09-04 22:02 UTC
Lasted
21 min
until 2026-09-04 22:23 UTC
Worst impact
Degraded
Timeline
2 updatesInvestigating
21 min 100%
Updates
Times in UTCAs posted by GitHub
On September 4, 2026, between approximately 21:45 and 22:07 UTC, some users experienced errors and elevated latency for repository operations. The incident was fully resolved at 22:23 UTC. The cause was a capacity change that spread one of our clusters across additional availability zones; our zone-aware traffic routing kept sending requests to the original zone for performance, overloading a small set of servers while the new capacity sat idle. We resolved the incident by reverting the change and letting traffic rebalance. We are improving per-zone capacity guarantees, cross-zone load-shedding, and pre-production testing of multi-zone changes to prevent recurrence.
We are investigating reports of impacted performance for some GitHub services.
GitHub in the last 90 days
Full historyIncidents in 90 days
46
Days with an incident
34
Median duration
1 h 29 min
This incident
76% shorter than the median
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