There were 4 Prefect Horizon outages since February 3, 2026 totaling 21h 10m of downtime. Each is summarised below — incident details, duration, and resolution information.
Build system is experiencing delays kicking off jobs. This impacts Hosted servers; external connectors and Remixes are unaffected. Request serving is also unaffected Engineering team is investigating
Background job system is caught up, and Hosted server builds should be triggered normally
MCP server builds are delayed due to a degradation in our background job system. The team is investigating Request serving is not impacted
A fix has been rolled out for the background system, and build jobs are catching up
Background job system is fully operational and builds are being started normally
GitHub has reported an outage that impacts Git operations, which impacts Horizon builds being unable to fetch source code from Hosted servers. This causes cloning failures any new builds that are linked to a GitHub repository. External server builds, Remix server builds, and MCP request...
Git operations have been restored, and Hosted Server builds are functioning normally
Github webhooks are delayed, so Horizon builds are not triggering on commit pushes. The team is investigating
Commit events from Github are delayed but eventually firing. Horizon builds are still being created. The team is still investigating
Github push event latency is improving, and our monitoring shows decreased commit-to-build latency. The team will continue to monitor
This is now resolved
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