Glossary Terms

observability

Observability is being able to understand what's actually happening inside a running system, including a WordPress site, from the data it gives off: logs of events, metrics like error rates and response times, and traces that follow a single request through the whole stack. For a site operator it means having dashboards that show PHP error rates, slow database queries, HTTP status codes, and cache hit rates, not just a green or red "is it up" light. Tools like New Relic, Datadog, and WP Engine's built-in performance monitor provide this. The payoff is catching a slow query or a rising error rate before it turns into pages timing out for real visitors, instead of finding out when someone complains.