https://www.netdata.cloud/

I like Uptime Kuma, but it only monitors if a service is online or not. I'm up to 21 services now so I'm not interested in all their details, just if I need to fix something urgently.

Grafana + Prometheus + data gathering will at least give you the resource and usage stats.

I’m using Zabbix to monitor the most important bits.

I'd swap Prometheus for VoctoriaMetrics. It's a drop-in replacement with a much better resource consumption story and a few extra goodies.

Grafana + Prometheus dashboards can be quite addicting or useful. Noted.lol put together a nice tutorial for getting started.

For most of my services though, I simply use Uptime Kuma which then sends an alert to Gotify when my services go down or whatnot, Gotify then instantly notifies my phone so I can be aware. It helps keep the spouse happy when their go to service for some reason crashed. :)

How much do you point and click your setup?

As I use nagios

I've not found a good solution for actual constant monitoring and I'll be following this thread, but I have a similar/related item: I use healthcheck.io (specifically a self-hosted instance) to verify all my cron jobs (backups, syncs, ...) are working correctly. Often even more involved monitoring solutions do not cover that area (and it can be quite terrible if it goes wrong), so I think it'll be a good addition to most of these.