Use APKPure App
Get Nagios old version APK for Android
Nagios monitoring tool
Nagios app, gives you an idea about nagios monitoring tool , this nagios app makes you browse the open source nagios site : http://nagios.sourceforge.net/docs/3_0/quickstart.html.nagios app is filled with with all installation methods for all linux distribtions.there's a youtube nagios videos section too ,