System monitor softwares

I have a few linux boxes, i'm looking for a software/script that i can use to monitor them all at once, and the more details the better.

Sometime, my system went down, and i have no clue what caused it, after request a reboot, server is back up, but it went down again the next day. So i don't know if there's any software can let me know when/howlong/why the system went down.

Your input is greatly appreciated
Thanks

 

 

 

 

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