Incident Library
Applied filters ComponentCDN and edge networkSymptomConnection resetsOrganisationGoogle CloudClear allEvery case under the filters, with no sentence; newest first.
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  1. IL-0338 Google Cloud HTTP(S) and TCP/SSL Proxy load balancers returned 502s or reset connections on 33% to 87% of requests
    Google Cloud2018
    Symptoms

    From 12:17 to 12:49 PDT on 17 July 2018, Google Cloud HTTP(S) Load Balancers answered a share of requests with 502 return codes, and connections to TCP/SSL Proxy Load Balancers were reset. The share of failed requests moved between 33% and 87% during those 32 minutes, and automated monitoring alerted Google engineers at 12:19.

    High error rateConnection resetsHigh latency
    Trigger

    A configuration change in the production environment intermittently set off a bug in a new feature of the second-layer Google Front Ends.

    Root cause
    Software defect
    Component
    Cloud load balancerCDN and edge network
    Contributing factor
    Gap in automated testsExcessive blast radius
    Detection

    Automated monitoring alerted Google's engineering team at 12:19 PDT, two minutes after the 502s began.

    Remediation
    • Reverted the configuration change at 12:44 PDT, which stopped the GFE restarts
    Action items
    • Add safeguards that disable features not yet in service
    • Harden the GFE testing stack against latent bugs in production binaries that make a task restart
    • Isolate the shards of GFE pools further from each other to reduce the scope of failures
    • Build a consolidated dashboard of all configuration changes for GFE pools
    View case
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This case involves CDN and edge network and 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
CDN and edge networkCloud load balancer
Contributing factor
Excessive blast radiusGap in automated tests
Organisation
Google Cloud
  1. IL-0338 Google Cloud HTTP(S) and TCP/SSL Proxy load balancers returned 502s or reset connections on 33% to 87% of requests
    Google Cloud2018