Function: Ajax handler for site health check to update the result status.

Function: Ajax handler for site health check to get directories and database sizes.

Function: Ajax handler to renew the REST API nonce.

Function: Ajax handler to enable or disable plugin and theme auto-updates.

Function: Ajax handler sends a password reset link.

Function: Ajax handler for site health checks on loopback requests.

Function: Ajax handler for site health checks on server communication.

Function: Ajax handler for site health checks on background updates.

Function: Ajax handler for generating a password in the no-privilege context.