Prefect Horizon Outage History

Prefect Horizon is up right now

Pingoru has recorded 7 incidents for Prefect Horizon: 7 in the last 12 months and 2 in the last 90 days.

Source: status.horizon.prefect.io

7incidents recorded
7last 12 months
2last 90 days
3 hourstypical duration
Incidents per month
012AprMayJunJulAugSepOct1
Share of hours with an open incident, any severity
0%50%100%AprMayJunJulAugSepOct0%
Pingoru began tracking Prefect Horizon in April 2026, so earlier months are not shown. Hover a bar for its value.
Show as a table
MonthIncidentsHours with an open incident
April 2026112 of 720 (2%)
May 202600 of 744 (0%)
June 202600 of 720 (0%)
July 202610 of 744 (0%)
August 202611 of 744 (0%)
September 202600 of 720 (0%)
October 202611 of 569 (0%)

Incidents, newest first

Minor October 21, 2026 Delayed builds from GitHub pushes 1h 9m Builds

Started Oct 21, 2026, 04:34 PM UTC· resolved Oct 21, 2026, 05:43 PM UTC

  1. monitoring Oct 21, 2026, 04:34 PM UTC

    Builds triggered by GitHub pushes are starting 10–25 minutes late. GitHub is having an incident that delays webhook deliveries (githubstatus.com: http://githubstatus.com). Builds run normally once they start, and running servers are not affected. We're monitoring and will update when delivery times return to normal.

  2. resolved Oct 21, 2026, 05:43 PM UTC

    GitHub webhook deliveries have recovered and builds are starting normally again.

Read the full incident report →

Minor August 31, 2026 MCP Serving slow responses and errors 30m MCP Serving

Started Aug 31, 2026, 05:30 PM UTC· resolved Aug 31, 2026, 06:01 PM UTC

  1. investigating Aug 31, 2026, 05:30 PM UTC

    We are investigating reports of slow responses and errors when serving MCP requests.

  2. identified Aug 31, 2026, 05:46 PM UTC

    We have identified the cause of the increased latency and errors affecting MCP Serving and are working on a resolution.

  3. resolved Aug 31, 2026, 06:01 PM UTC

    MCP Serving has recovered, and we are no longer seeing elevated latency or errors.

Read the full incident report →

Minor July 10, 2026 Server builds delayed – Horizon: Builds (Builds)

Started Jul 10, 2026, 04:58 PM UTC· resolved Jul 10, 2026, 04:58 PM UTC

  1. investigating Jul 10, 2026, 04:58 PM UTC

    Background job system is impacted by outside service outage. Server Builds are delayed. The team is investigating MCP serving is unimpacted

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Minor April 15, 2026 Hosted server builds are delayed 11h 57m Horizon: Builds (Builds)

Started Apr 15, 2026, 12:20 PM UTC· resolved Apr 16, 2026, 12:17 AM UTC

  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 1h 3m Horizon: Builds (Builds)

Started Mar 26, 2026, 10:42 PM UTC· resolved Mar 26, 2026, 11:45 PM UTC

  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 4h 16m Horizon: Builds (Builds)

Started Feb 09, 2026, 03:53 PM UTC· resolved Feb 09, 2026, 08:09 PM UTC

  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

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Minor February 3, 2026 Github webhooks are delayed 3h 54m Horizon: Builds (Builds)

Started Feb 03, 2026, 03:25 PM UTC· resolved Feb 03, 2026, 07:19 PM UTC

  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 →