Populate our list of cron events and store them to a class-wide variable.
Check if any scheduled tasks have been missed.
Run a loopback test on our site.
Test if debug information is enabled.
Test if your site is serving content over HTTPS.
Check if the site supports automatic minor updates.
Enqueues the site health scripts.
Run the SQL version checks.
Test if `wp_version_check` is blocked.
Tests for WordPress version and outputs it.
Test if plugins are outdated, or unnecessary.
Test if themes are outdated, or unnecessary.
Test if the supplied PHP version is supported.
Check if the passed extension or function are available.