I've used nagios, check_mk, zabbix and currently using prometheus + grafana. I suggest prometheus + grafana. But you may want to use netdata as the exporter instead of node_exporter. Or both.
There's going to be a limit (3000€?) for how much you can store on the digieuro account
Tips are a way for service industry workers to avoid taxes. I wonder if there's any reliable statistics on how many workers in the service industry report their tips accurately to the IRS
Run it on some free or cheap cloud instance https://paul.totterman.name/posts/free-clouds/
@ptman
@sopuli.xyz