Uptime Percentage: Why Your Check Interval Caps It
An uptime percentage is a sample, not a recording, and its precision is bounded by your check interval. Here is the arithmetic and why two tools disagree.
#glossary
18 posts tagged "Glossary".
Real User Monitoring: What RUM Sees and What It Misses
Real user monitoring times pages inside visitors' browsers. Here is what those APIs report, how much of it never arrives, and why it cannot detect an outage.
HTTP Status Codes: Which Ones Should Page You
Most HTTP status codes are noise on a pager. Here is which ones should wake you, which belong in a ticket, and how to assert on them.
Chaos Engineering: Experiments That Prove Detection
Chaos engineering breaks part of a live system on purpose. The value comes from the hypothesis, the blast radius and an independent check that noticed.
Canary Deployment: Rollout Steps and Pass Criteria
A canary deployment gives a new build a small slice of live traffic first, and the hard part is deciding what a passing slice actually looks like.
Application Monitoring: Three Vantage Points Explained
Application monitoring runs from three vantage points - inside the process, on the host and out on the internet - and each one is blind where the others see.