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There's munin, have you had any experience with that?
I have a mailinabox instance on a minimal "Basic" DigitalOcean droplet (1GB RAM, 1 CPU) which uses munin, it hasn't had any issues. I haven't used it outside that context, however. It's also not in a container, it is installed directly on the droplet.
If you care more about status than metrics, you can try Uptime Kuma (also on Reddit r/UptimeKuma). You can monitor not only simple pings or http content, but much more parameters using push notifications (combining msg and ping values).