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A list of available exporters:
https://prometheus.io/docs/instrumenting/exporters/
Gitlab included Exporter
Install using go:
go get github.com/prometheus/mysqld_exporter
Apache Exporter
[program:apache_exporter] command=/root/go/bin/apache_exporter -insecure -scrape_uri "http://localhost/server-status/?auto" autostart=yes autorestart=yes startretries=3 stderr_logfile=/var/log/prometheus_exporter/apache_exporter.err.log stdout_logfile=/var/log/prometheus_exporter/apache_exporter.log user=www-data
MySQL Exporter
[program:mysql_exporter] command=/root/go/bin/mysqld_exporter --config.my-cnf /etc/mysql/debian.cnf autostart=yes autorestart=yes startretries=3 stderr_logfile=/var/log/prometheus_exporter/mysql_exporter.err.log stdout_logfile=/var/log/prometheus_exporter/mysql_exporter.log user=root # don't run this process as root
Grafana-rrd-server - https://github.com/doublemarket/grafana-rrd-server
[program:grafana-rrd-server] command=/root/go/bin/grafana-rrd-server -r /var/lib/munin/KnallimallOrg/ autostart=yes autorestart=yes startretries=3 stderr_logfile=/var/log/prometheus_exporter/grafana-rrd-server.err.log stdout_logfile=/var/log/prometheus_exporter/grafana-rrd-server.log user=root # don't run this process as root
See Grafana website for available dashboards: https://grafana.com/dashboards