Percentiles like p90, p95, and p99 describe how slow things get for the “worst” slice of requests—something the mean often hides. This guide explains min, max, mean/average, and percentiles in plain language, plus when to use each in monitoring and SLOs.
AWS experienced a broad incident this morning that triggered elevated errors and latency across popular services. Most Reliable Penguin clients were unaffected; where needed, we executed DR runbooks and failed over to alternate regions.
A plain-English, story-driven guide to HTTP 499 “Client Closed Request” errors—what they are, why they happen (think users navigating away or flaky mobile networks), how they differ from 408, and practical steps to reduce them with faster responses, smarter timeouts, and cleaner front-end behavior.
A practical, copy-pasteable guide to make systemd jobs actually alert you when they fail. We show how to wire OnFailure= handlers to multiple channels—email, Slack, Microsoft Teams, PagerDuty, generic webhooks, AWS SNS, wall, and MOTD—using small scripts and templated units. Includes testing tips, rate-limiting, and security notes so your servers stay quiet until something truly needs attention.
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