Google Cloud's us-west1 Region Experiences 2-Hour Outage Due to Fiber Maintenance and Automated Rerouting Failure

A detailed incident report revealed that Google Cloud's us-west1 region suffered a 2-hour and 22-minute outage on August 20, 2026, affecting 33 services including Compute Engine, Google Kubernetes Engine, and Cloud Storage. The root cause was identified as scheduled fiber optic maintenance that unexpectedly compromised network capacity, compounded by a failure in automated rerouting mechanisms. This incident highlights challenges in cloud reliability, even for major providers, and raises questions about the effectiveness of automated systems in preventing downtime.