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Prometheus for Metrics
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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CheckMK for monitoring
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I recently started using LibreNMS. So far it has been great. I've firewalls, switches, servers and services that I wanted to monitor and setup alarms for. Very easy to setup! Just install or enable SNMP service on asset and point LibreNMS to their direction. I've SNMP running on management vlan on local network and Wireguard tunnels to remote assets.
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I'm using Pushover but I don't think the transport matters. By default it sends you a mib code but you can customize the notifications with templates. Here are couple examples.
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Grafana
The open and composable observability and data visualization platform. Visualize metrics, logs, and traces from multiple sources like Prometheus, Loki, Elasticsearch, InfluxDB, Postgres and many more.
We use the https://grafana.com stack at work and it's been easy to work with. The ecosystem for it is pretty expansive too.