Health Check & Troubleshooting is a new plugin by The WordPress.org community. The plugin test the WP install for errors. The plugin will troubleshoot some common problems offer solutions to solve install issues.
Before anyone runs the plugin, it is ideal to do a backup. I was too eager to explore this plugin and ran it. I had no errors on my WP network install. My multisite install had some issues with the scheduling functions. In both sites, the troubleshooting section, both sites were clear of errors.
The Health Check & Troubleshooting is definitely a great plugin to install. For more information, read up about it at https://make.wordpress.org/support/handbook/appendix/troubleshooting-using-the-health-check/.