Prefect Horizon Outage History

Prefect Horizon is up right now

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.

Source: https://horizonstatus.io/posts/dashboard

Minor April 15, 2026

Hosted server builds are delayed

Detected by Pingoru
Apr 15, 2026, 12:20 PM UTC
Resolved
Apr 16, 2026, 12:17 AM UTC
Duration
11h 57m
Affected: Horizon: Builds (Builds)
Timeline · 2 updates
  1. investigating Apr 15, 2026, 12:20 PM UTC

    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

  2. resolved Apr 16, 2026, 12:17 AM UTC

    Background job system is caught up, and Hosted server builds should be triggered normally

Read the full incident report →

Minor March 26, 2026

Server build jobs are delayed

Detected by Pingoru
Mar 26, 2026, 10:42 PM UTC
Resolved
Mar 26, 2026, 11:45 PM UTC
Duration
1h 3m
Affected: Horizon: Builds (Builds)
Timeline · 3 updates
  1. investigating Mar 26, 2026, 10:42 PM UTC

    MCP server builds are delayed due to a degradation in our background job system. The team is investigating Request serving is not impacted

  2. investigating Mar 26, 2026, 11:18 PM UTC

    A fix has been rolled out for the background system, and build jobs are catching up

  3. resolved Mar 26, 2026, 11:45 PM UTC

    Background job system is fully operational and builds are being started normally

Read the full incident report →

Minor February 9, 2026

Increased Build failures due to GitHub outage

Detected by Pingoru
Feb 09, 2026, 03:53 PM UTC
Resolved
Feb 09, 2026, 08:09 PM UTC
Duration
4h 16m
Affected: Horizon: Builds (Builds)
Timeline · 2 updates
  1. investigating Feb 09, 2026, 03:53 PM UTC

    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...

  2. resolved Feb 09, 2026, 08:09 PM UTC

    Git operations have been restored, and Hosted Server builds are functioning normally

Read the full incident report →

Minor February 3, 2026

Github webhooks are delayed

Detected by Pingoru
Feb 03, 2026, 03:25 PM UTC
Resolved
Feb 03, 2026, 07:19 PM UTC
Duration
3h 54m
Affected: Horizon: Builds (Builds)
Timeline · 4 updates
  1. investigating Feb 03, 2026, 03:25 PM UTC

    Github webhooks are delayed, so Horizon builds are not triggering on commit pushes. The team is investigating

  2. investigating Feb 03, 2026, 03:49 PM UTC

    Commit events from Github are delayed but eventually firing. Horizon builds are still being created. The team is still investigating

  3. investigating Feb 03, 2026, 05:28 PM UTC

    Github push event latency is improving, and our monitoring shows decreased commit-to-build latency. The team will continue to monitor

  4. resolved Feb 03, 2026, 07:19 PM UTC

    This is now resolved

Read the full incident report →

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