Doesn’t really keep to your requirements but check out cockpit. It monitors CPU/memory/disk/network of the host it’s on, it can monitor KVM virtual machines, it’s not docker afaik but simple to set up, uses your Linux login, has a terminal you can use straight in the web UI to get whatever info you’re missing, it uses pmcp and pmlogger for all the info so the number of processes and ports is fairly low.
Dunno about configs, and I’m not sure if/how it can set up alerting though. I tried looking with a basic Google search but only this numbnuts “Neo” guy popped up on his circlejerk forum https://community.unix.com/t/how-to-configure-notification-in-cockpit/377055
A custom bash script will do the job then. You might not want to use docker though as that adds a lot of complexity when it comes to communicating back to/from the host.