AdBook+ System Performance

Summary of Impact

On the afternoon of June 22, 2026, users of adbook03.fattail.com and adbook04.fattail.com experienced trafficking errors and slow response time on campaign uploads and reporting.

Performance degradation was first observed and reported at approx. 4:30pm EST. The FatTail engineering team was able to resolve and restore services at approximately 6:25pm EST.

Root Cause

The degradation was caused by elevated request volume that put high pressure on the service caching mechanisms, which caused a slowdown in response time.

Mitigation

There were two steps taken to mitigate the issue:

1. The reporting services were restarted to clear out orphaned (timed out) requests that were queued up in the caching service.
2. Cache parameters were updated to provide more resources to handle elevated request volume. 

Next Steps

The team is implementing monitoring to raise alerts when cache resources are out of normal operating zones.