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check_systemd
This systemd check for nagios compatible monitoring systems will report a degraded systemd to your monitoring solution. It can also be used to monitor individual systemd services and timers units.
For alerting for Linux systems, I use Icinga with check_ssh and check_systemd (caveat: distributed primarily on PyPI) with Thruk as the single pane of glass front-end to per-datacenter installations of Icinga.
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InfluxDB
InfluxDB high-performance time series database. Collect, organize, and act on massive volumes of high-resolution data to power real-time intelligent systems.
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Zabbix
Real-time monitoring of IT components and services, such as networks, servers, VMs, applications and the cloud.
Zabbix also tends to get favorable reviews in this sub, but we were only using it for resource utilization graphing, which Observium / LibreNMS do out of the box with much less configuration.
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Thruk
Thruk is a multibackend monitoring webinterface for Naemon, Nagios, Icinga and Shinken using the Livestatus API.
For alerting for Linux systems, I use Icinga with check_ssh and check_systemd (caveat: distributed primarily on PyPI) with Thruk as the single pane of glass front-end to per-datacenter installations of Icinga.
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