On 9/24, beginning at 9:10 a.m. ET, Yext engineers began tracking elevating latencies and error rates in Live API. These issues resulted in slower response times and some errors in Answers and Pages. The root cause was identified by 3:04 p.m. ET, and latencies were restored to normal by 5:40 p.m. ET.
The following day, on 9/25, beginning at 12:10 p.m. ET, Yext engineers observed similar symptoms and immediately applied mitigatory measures. Service was restored by 12:26 p.m. ET.
Performance improvement changes meant to improve the service had introduced a bug which increased latencies and error rates when combined with internal operations.
We have reverted the change, and will be conducting more testing in the future to ensure that internal operations do not interfere with such changes.