· 2 min read
What does an availability zone promise?
A London power event in one zone became eight hours of region-wide errors. A briefing on what a zone isolates, and where that isolation quietly leaks.
#resilience#availability#incident-analysis
Tagged: incident-analysis
3 articles
· 2 min read
Does your health check use the same path as your traffic?
A Google Cloud outage severed inter-zone traffic while health checks on a separate address space kept reporting healthy. Probes that avoid the data path measure the wrong thing.
#observability#health-checks#incident-analysis
· 3 min read
What happens when a call has no timeout?
CircleCI's July 2 outage came from connections that never timed out. A slow dependency became an unavailable product, and the review question is which of your calls wait forever.
#resilience#timeouts#incident-analysis