Alertmanager
The Alertmanager handles alerts sent by client applications such as the Prometheus server. It takes care of deduplicating, grouping, and routing them to the correct receiver integration such as email, PagerDuty, or OpsGenie. It also takes care of silencing and inhibition of alerts.
Alertmanager Installation Documentation
Node Exporter
The Prometheus Node Exporter exposes a wide variety of hardware- and kernel-related metrics.