Question

sudo systemctl restart prometheus

Failed to restart prometheus.service: Unit prometheus.service is masked.

Answer

systemctl status prometheus

● prometheus.service
     Loaded: masked (Reason: Unit prometheus.service is masked.)
     Active: inactive (dead)


ls -l /etc/systemd/system/prometheus.service
lrwxrwxrwx 1 root root 9 Jun 25  2022 /etc/systemd/system/prometheus.service -> /dev/null
sudo apt install -y prometheus