CCS API outage
Timeline · 1 update
- resolved Sep 04, 2026, 03:38 PM UTC
Between 21:14 and 22:13 UTC on 3 September, the CCS (Custom Cohort Segmentation) API experienced degraded performance. During this period around a third of segmentation requests, and up to half at peak, returned HTTP 500 errors after a delay of several seconds. Events sent in the affected requests were still collected. However, no cohorts were returned for those requests, and the user's server-side segmentation state was not updated with those events This only affected segmentation done via direct calls to the CCS API. Requests outside this window were unaffected. The issue is now resolved and the API has returned to normal. This was caused by a failure in an upstream service which impacted the CCS API. Improvements to both the upstream service and the CCS API have been identified and are being worked on which will prevent a reoccurrence of this failure and its impact.