Blacksmith incident
US west cache failure
Blacksmith experienced a minor incident on September 29, 2026 affecting Actions Cache (US West Cache), lasting 1h 32m. The incident has been resolved; the full update timeline is below.
Affected components
Update timeline
- investigating Sep 29, 2026, 05:00 PM UTC
We are investigating failing GitHub Actions cache operations for jobs running in us-west since approximately 16:10 UTC. Affected jobs may see cache restores and saves fail and fall back to a full install, which can make those jobs run longer or fail, while jobs in other regions are not affected.
- identified Sep 29, 2026, 05:09 PM UTC
We have identified the cause of the failures, and we are implementing a fix to restore cache service. Customers with jobs in us-west may still see cache restores and saves fail and fall back to a full install, which can make those jobs run longer or fail, while jobs in other regions are not affected.
- monitoring Sep 29, 2026, 05:35 PM UTC
We have restored the cache infrastructure in us-west, and cache failures have decreased but are not yet back to normal. Jobs in us-west may still see some cache restores and saves fail and fall back to a full install, while the earlier delayed job starts have cleared and other regions are unaffected. We are bringing additional cache capacity online to fully restore service.
- monitoring Sep 29, 2026, 06:06 PM UTC
Cache errors for jobs in us-west have largely subsided. As we complete recovery, some jobs may see a one-time cache miss on their next run. We are monitoring and will provide an update within the next hour.
- resolved Sep 29, 2026, 06:32 PM UTC
This incident is resolved. GitHub Actions cache operations for jobs in us-west have returned to normal, and any jobs that failed during the incident can be re-run.