gentoo-overlay/app-metrics/prometheus/files/prometheus.service

[Unit]
Description=Prometheus
Wants=network-online.target
After=network-online.target

[Service]
Type=simple
User=prometheus
Group=prometheus
ExecStart=/usr/bin/prometheus \
  --web.enable-lifecycle \
  --config.file=/etc/prometheus/prometheus.yml \
  --storage.tsdb.path="/var/lib/prometheus/data" \
  --web.console.templates=/etc/prometheus/consoles \
  --web.console.libraries=/etc/prometheus/console_libraries \
  --web.listen-address=0.0.0.0:9090 \
  --web.enable-admin-api 

Restart=always

[Install]
WantedBy=multi-user.target