How do you monitor your network (list of devices connected, data in/out, etc)?

I own a TP-Link ER605 router and a switch. I'm looking for a self-hosted solution to monitor my network carefully and set up alerts for new devices and specific data transfer thresholds. I use Grafana for most of my home lab and would love to set that up over there. I tried to setup SNMP with Grafana but was unsuccessful at it. What are people using in this community?