Real incidents from live production systems. Learn how critical infrastructure failures were diagnosed, debugged, rolled back, and permanently architected against in the real world.
A memory leak in a new coupon feature caused cascading Out-Of-Memory (OOM) kills across our payment microservices namespace, leading to 12 minutes of complete downtime under load.
A wrong environment variable in a CI build runner caused aws s3 sync --delete to target the production bucket instead of staging, deleting all static web assets in seconds.
A background job worker failed to close database connection sockets, exhausting the RDS pool limits and taking down our API for 23 minutes.
A CDN header optimization task stripped authorization tokens from cache key definitions, caching private profile pages and serving them to random visitors for 22 minutes.
A legacy 86,400-second (24-hour) DNS TTL value caused client applications to continue writing to our old database master after DNS records were switched, delaying our migration.
A misconfigured Helm chart created an infinite resource synchronization loop in ArgoCD, causing controller CPU utilization to spike to 100% and taking down our Prometheus instance.
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