# Loadbalancer error rate for web service (cny stage) violating SLO (Severity 2) **Problem**: We've observed a sharp increase in HTTP 5xx errors from the load balancer for the web service in the cny stage, reaching an aggregated error rate of 0.185% over the past 6 hours and violating the SLO. **Impact**: The error rate exceeded the SLO threshold, primarily affecting merge request widget endpoints for web service users in the cny stage. Multiple teams, including create, deploy, geo, gitaly, manage, and plan, are impacted. **Causes**: A spike in GRPC::Unavailable 500 errors occurred immediately after a recent rollout, with errors originating from both Rails and Workhorse components. **Response strategy**: Unknown _This ticket was created to track_ [_INC-10111_](https://app.incident.io/gitlab/incidents/10111)_, by_ [_incident.io_](https://app.incident.io) 🔥