Agreed. Have used monit instances on every server I manage for nearly 10 years and have been using m/monit since about a year ago (finally provided them with s

Agreed. Have used monit instances on every server I manage for nearly 10 years and have been using m/monit since about a year ago (finally provided them with some money after all these years) and with it, I can check every servers' health from a single web app, I can make alert message to Mattermost (or anywhere else as it can run custom script) and its performance metric graph capability is good enough I dropped munin for it. The great thing about it is that it's absolutely lightweight and its config files are so easy to understand and has broad checking mechanism. I can also check SSL certificate ages and in case certbot fails to renew them, I get warned well before the expiration date.