Files: wp-admin/includes/class-wp-site-health.php

Populate our list of cron events and store them to a class-wide variable.

Check if any scheduled tasks have been missed.

Check if any scheduled tasks are late.

Run a loopback test on our site.

Create a weekly cron event, if one does not already exist.

Test if debug information is enabled.

Run our scheduled event to check and update the latest site health status for the website.

Test if your site is serving content over HTTPS.

Check if the HTTP API can handle SSL/TLS requests.

Test if scheduled events run as intended.

Test if WordPress can run automated background updates.

Test if loopbacks work as expected.

Test if HTTP requests are blocked.

Test if the REST API is accessible.

Return a set of tests that belong to the site status page.