Metrics, Monitoring, and Graphing Dashboards

Icinga / Incinga2 - open source enterprise monitoring and notification
Graphite - highly scalable real-time graphing system
Graphana - rich graphing, dashboards, templates
Sensu
Ganglia
Prometheus

Icinga 2 contains an built-in implementation of performance graphing via add-ons such as PNP4Nagios, NagiosGrapher, InGraph, Graphite and Grafana. There is a module to integrate Icingaweb2 and Graphite.
collectd
statsd
Splunk

Hosted Solutions
AppNeta
NewRelic

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