I don't usually manage servers but here we are. I've a VPS running about 5 php web sites and I need an easy-to-setup monitoring solution. It should be lightweight - to run on the same machine, provide reliable alerts via email (low disk space, low inode, dead mysql/httpd/postfix/redis processes) and historical data views (cpu, mem, net, io, mysql, httpd, postfix, redis). The server runs centos7 so it's preferable to have it available in official repositories, or from a reliable 3rd party.
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