Incident Library
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  1. IL-0584 Cloud CDN at Osaka served corrupted JavaScript files, and a single-page app failed with a SyntaxError in western Japan
    Monicle2024
    Symptoms

    Some users reported that a Monicle web service could not be used. The service is a single-page app (SPA) served through Google Cloud Load Balancing and Cloud CDN, and in the affected browsers the app stopped with a SyntaxError. Users in eastern Japan were not affected; users in western Japan were.

    Response quality degradation
    Root cause
    Cloud provider outage
    Component
    CDN and edge network
    Contributing factor
    –
    Detection

    Some users reported that they could not use the system, and a war room was opened right away because of the product and the extent of the impact.

    Remediation
    • Purged the Cloud CDN cache after the corruption was seen at KIX (Osaka) but not at NRT (Tokyo)
    • Enabled compression_mode for Cloud CDN content on Cloud Load Balancing, after which the app worked for users again
    Action items
    • Stay aware of which parts of the service are single points of failure, remove them where the cost is justified, and prepare to respond quickly to failures in PaaS and SaaS products
    Lessons

    The author states that there is no specific countermeasure for this incident yet. The lesson drawn is to keep in mind which parts of the service are single points of failure and to be ready to act quickly on failures in PaaS and SaaS products.

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Check your cluster for this

This case involves CDN and edge network. 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

Cloud provider outage1 case

Component
CDN and edge network
Contributing factor
–
Organisation
Monicle
  1. IL-0584 Cloud CDN at Osaka served corrupted JavaScript files, and a single-page app failed with a SyntaxError in western Japan
    Monicle2024