us-central1: Google App Engine Standard experiencing increased latency and pending queue aborted error request rate.

We apologize for the inconvenience this service disruption may have caused. We would like to provide some information about this incident below. Please note, this information is based on our best knowledge at the time of posting and is subject to change as our investigation continues. If you have experienced impact outside of what is listed below, please reach out to Google Support by opening a case using https://cloud.google.com/support (All Times US/Pacific) Incident Start: 07 September 2021 11:19 Incident End: 08 September 2021 11:00 Duration: 23 hours, 41 minutes Affected Services and Features: Google App Engine - Standard Google Cloud Functions Regions/Zones: us-central1 Description: Google App Engine and Google Cloud Functions experienced elevated latency on requests in us-central1 on a small number of projects for a duration of 23 hours, 41 minutes. From preliminary analysis, the root cause of the issue is due to a sudden increase in load within the region. Customer Impact: Affected customers would have experienced elevated serving latency on apps and functions. This may have manifested with http errors and corresponding cloud logging entries such as: “Request was aborted after waiting too long to attempt to service your request.” Additional Details: Impact was mitigated by applying targeted throttling.

The issue with Google App Engine and Cloud Functions has been resolved for all affected projects as of Wednesday, 2021-09-08 12:24 US/Pacific. There is no further impact to our customers. We thank you for your patience while we worked on resolving the issue.

Summary: us-central1: Google App Engine Standard and Cloud Functions experiencing increased latency and pending queue aborted error request rate. Description: Further investigation into the increased latency issue has confirmed that we are also observing an increase in pushbacks to requests (increase in pending queue aborted error request rate) for some customers. Our engineering team continues to work on the mitigation to reduce the pushback errors and reduce the latency observed. We will provide more information by Wednesday, 2021-09-08 12:30 US/Pacific. Diagnosis: Customer may observe increased latency and heightened pending queue aborted error request rate. Workaround: None at this time.