Cloud Run and App Engine fail to serve some requests in us-east4, northamerica-northeast1 and northamerica-northeast2

Summary: Cloud Run and App Engine fail to serve some requests in us-east4, northamerica-northeast1 and northamerica-northeast2 Description: Mitigation work is currently underway by our engineering team. We do not have an ETA for mitigation at this point. We will provide more information by Monday, 2023-10-23 06:00 US/Pacific. Diagnosis: Cloud Run services and App Engine apps appear unreachable for some requests targeting us-east4, northamerica-northeast1, northamerica-northeast2. This affects only clients using Quick UDP Internet Connections (QUIC) protocol and not falling back to HTTP/2 on a failed handshake. Workaround: Impacted users can use plain HTTP/2 instead of QUIC or Fail over to unaffected region