Plugin to monitor bandwidth usage

[Serge Dukic]

Hi, 

I've got some strange issues with a web application, where it loses connectivity at a certain time each night. After a bit of investigation, I think that this might be related to network congestion. i.e. the backups are taking up all of the available bandwidth and as a result the web app connections time out. 

I'd like to use a plugin to monitor the amount of bandwidth which is being used by the server as a whole to see if it is ever saturated. e.g. if bandwidth remains at 90% of 1Gb/s send a warning 

Does anyone know of a plugin which would allow me to monitor this? 

Thank you 
Serge 
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