Illustrative Mathematics incident

PostHog feature flag api errors impacting on accessim.org

Minor Resolved View vendor source →

Illustrative Mathematics experienced a minor incident on October 28, 2025 affecting AccessIM, lasting 18h 9m. The incident has been resolved; the full update timeline is below.

Started
Oct 28, 2025, 08:06 PM UTC
Resolved
Oct 29, 2025, 02:15 PM UTC
Duration
18h 9m
Detected by Pingoru
Oct 28, 2025, 08:06 PM UTC

Affected components

AccessIM

Update timeline

  1. investigating Oct 28, 2025, 08:06 PM UTC

    PostHog feature flag api errors are making some features on accessim.org inaccessible. This includes features like math tools that only show up if the relevant feature flag is set to true. Since the app can't get the result of the feature flag, it defaults to false, thus hiding the feature. Engineering is monitoring PostHog status updates, and will update when we have more information.

  2. monitoring Oct 28, 2025, 10:01 PM UTC

    PostHog has released a fix and they are monitoring the results. Some functionality may return to accessim.org. We will update when PostHog confirms they've resolved the issue on their end, and we will confirm things should be working on ours.

  3. resolved Oct 29, 2025, 02:15 PM UTC

    The issue with PostHog has been resolved.