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  1. IL-0119 ChatGPT web service pods crash-looped on failing health checks after a Cosmos DB failure, leaving too few healthy pods to serve the web layer
    OpenAI2025
    Symptoms

    From 3:30am to 7:08am PT, chatgpt.com and a small number of OpenAI APIs returned elevated error rates. The status page classed the incident as a full outage.

    High error rateContainer crash loopProbe failures
    Trigger

    A failure of Cosmos DB in ChatGPT, at OpenAI's service provider.

    Root cause
    Cloud provider outage
    Component
    Application database
    Contributing factor
    Health check tied to a dependency
    Remediation
    • the service provider recovered the affected Cosmos DB databases at 4:25am PT
    • fixed the web server's health checking logic, which ended the pod crash loop
    Action items
    • Change the web systems to degrade more gracefully when they fail, including concurrency control and better load shedding
    • Make the database layer more resilient to service provider outages (described as already underway)
    Lessons

    The database came back at 4:25am PT, yet users saw errors until 7:08am PT: the web tier's own health checks kept removing pods after the dependency had recovered. The planned changes target the web tier's behaviour under failure, with concurrency control and load shedding, rather than the database alone.

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By root cause1

Cloud provider outage1 case

Component
Application database
Contributing factor
Health check tied to a dependency
Organisation
OpenAI
  1. IL-0119 ChatGPT web service pods crash-looped on failing health checks after a Cosmos DB failure, leaving too few healthy pods to serve the web layer
    OpenAI2025