Increased Publishing Error Rate Due to Concurrency Limits being Exceeded
Between 01:07 UTC and 03:04 UTC, our monitoring systems detected an abnormal increase in publishing errors, with rates escalating to 36%. Our team traced the root cause to concurrency limits being exceeded in functions critical to our publishing workflow.

Impact
A significant portion of publishing operations failed during the incident window, there was no significant impact on content delivery for traffic to hlx.page.

Root Cause
The incident was triggered by a surge in demand from a single customer using our Bring Your Own Markup feature, leading to a rapid increase in and a concurrency resource contention in our publishing infrastructure. This surge exceeded our concurrency limits, resulting in throttling and subsequent failures of publishing requests.