Installing Server Health Monitor via Plesk Installer GUI
Note: Make sure that port 8447 is opened in firewall. If it is closed and cannot be opened, use the command-line instructions.
Go to Tools & Settings > Updates and Upgrades.
On the Updates and Upgrades page, click Add/Remove Components.
On the Add/Remove Components page, select Server Process Monitor (System Health Monitor) and click Continue to begin the installation.