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  1. IL-0345 Many Render services in the Oregon region returned 503 errors for about four hours
    Render2020
    Symptoms

    Between 13:34 and 17:33 PST on Sunday 6 December 2020, many Render services in the Oregon region returned 503 (Service Unavailable) errors at an elevated rate, and the Render Dashboard was affected. Render's monitoring alerted the team at once. The status page reported upstream load balancers having trouble connecting to the rest of the infrastructure, and after an apparent fix the connectivity error rates rose again before the final fix.

    High error rate
    Trigger

    At 13:34 PST a customer API hosted in Oregon, one of the services with the highest request rates in the region, began holding incoming requests until they timed out.

    Root cause
    Software defect
    Component
    Cloud load balancer
    Contributing factor
    Excessive blast radiusGap in automated tests
    Detection

    Render's monitoring system notified the team immediately.

    Remediation
    • Rolled out a fix to the load balancing algorithm across all load balancers
    Action items
    • Add mechanisms that isolate services from each other in the routing and load balancing layers
    • Increase test coverage of the load balancing code
    • Add synthetic failure states to the continuous integration test suites
    • Put more focus on chaos engineering
    View case
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This case involves Cloud load balancer. kubegap audits a Kubernetes cluster for gaps like these, read-only, from Claude Code or Codex; its checks cite public reports like the ones in this library.

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By root cause1

Software defect1 case

Component
Cloud load balancer
Contributing factor
Excessive blast radiusGap in automated tests
Organisation
Render
  1. IL-0345 Many Render services in the Oregon region returned 503 errors for about four hours
    Render2020