Here are list of some of the server monitoring tools

Prometheus

Created by SoundCloud.com. It is written in GoLang. Very easy to install and setup. It work with Grafana to show very good graphs.

I have 2 installation of this. I don’t setup alerts yet.

https://prometheus.io/

Zabbix

Zabbix is written in PHP. I have tested this, configuration is more complex than Prometheus.

You can download it from

https://www.zabbix.com

• Install Zabbix Agent on CentOS/RHEL Server
• Install Zabbix Agent from Source on Linux
• Install Zabbix Server on Ubuntu from Source

NetData

NetData is written in C. You can see source code at https://github.com/firehol/netdata.

This looks very good. Many demo available on their site

https://my-netdata.io/

• Install netdata on Linux (Debian/Ubuntu/CentOS)