On May 15, 2026, from approximately 07:43 UTC to 08:48 UTC, GitHub Actions experienced a degradation that caused workflow runs to fail or experience delayed starts for a subset of customers. The incident was triggered by a planned failover of supporting infrastructure used by GitHub Actions. During that operation, an automated service discovery update did not propagate correctly, which caused traffic to be routed incorrectly and increased request timeouts in a core dependency for workflow orchestration.
At peak impact, 42% of Actions runs failed. Downstream services that depend on Actions workflow execution were also impacted, including GitHub Pages and Copilot cloud services. At 08:12 UTC, responders manually corrected the service discovery routing issue. Timeout and failure rates recovered shortly after, and we continued monitoring until full stabilization was confirmed across all affected services. The incident was marked resolved at 08:48 UTC.
To prevent recurrence, we are implementing failover guardrails that validate service discovery state before completing failover operations, strengthening pre-flight and post-flight verification checks, and improving dependency resilience to reduce timeout cascades during infrastructure events.
Posted May 15, 2026 - 08:48 UTC
The degradation has been mitigated. We are monitoring to ensure stability.
Posted May 15, 2026 - 08:41 UTC
We are monitoring an issue that was affecting GitHub Actions and causing downstream issues in GitHub Coding Agent and GitHub Code Review Agent. The issue has resolved now but we are closely monitoring our systems for full recovery.
Posted May 15, 2026 - 08:29 UTC
The degradation affecting Pages has been mitigated. We are monitoring to ensure stability.
Posted May 15, 2026 - 08:27 UTC
The degradation affecting Actions has been mitigated. We are monitoring to ensure stability.
Posted May 15, 2026 - 08:26 UTC
Pages is experiencing degraded availability. We are continuing to investigate.
Posted May 15, 2026 - 08:14 UTC
We are investigating reports of degraded availability for Actions
Posted May 15, 2026 - 08:13 UTC
This incident affected: Actions and Pages.
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