Here is a handy WordPress plugin that creates a dashboard to help you easily monitor server hardware and resource usage. System Dashboard displays IP address, health status, stats on active plugins and themes and other info. It shows RAM, disk and CPU load data in one place to save you time identifying potential issues.
System Dashboard for WordPress can also show relevant PHP information, including memory limit, post max size, extensions loaded, and max execution time. You will also be able to see directory sizes. This plugin has a total of 20 WordPress and 4 server modules. It works with Query Monitor and WP Console.