WP-Cron depends on site traffic and loopback requests, so important background jobs can drift or fail quietly. This guide explains when to keep it, when to replace it with server cron, and how to test it properly.
Practical Nagios `check_http` guidance for teams monitoring client or business-critical websites, including redirects, content checks, certificate age, and when to switch to `check_curl`.
If a site cutover, mail change, or API move is still resolving the old address, this guide shows the current Ubuntu DNS flush command, the legacy alias, and how to check whether another local cache is actually the problem.