Create Monitors for All Child Sites
To automatically create monitors for all child sites that don't have corresponding monitors,- Login in to your MainWP Dashboard
- Go to the MainWP > Extensions > Advanced Uptime Monitor page
- Go to the Monitoring tab
- Click the Create Monitors for all Sites button
- The extension will automatically create HTTP(s) monitors
Source Article:
https://kb.mainwp.com/docs/create-monitors-for-all-child-sites/