I’m a big fan of monit. It has some bells and whistles, but it will let you check all sorts of metrics and email, or whatever else if they get past a specified threshold. That’s very configurable, you could, for example, have a check to alarm if you had sustained > 20mbps over an hour, and also a short burst of 100 mbps over 2 minutes for example. Some of its other features i tend to like is that it can also check services either via a command, or via checking a certain port, etc, and, if desired, automatically restart them. It’s very easy to configure, and has a ton of examples on their wiki.
I’m a big fan of monit. It has some bells and whistles, but it will let you check all sorts of metrics and email, or whatever else if they get past a specified threshold. That’s very configurable, you could, for example, have a check to alarm if you had sustained > 20mbps over an hour, and also a short burst of 100 mbps over 2 minutes for example. Some of its other features i tend to like is that it can also check services either via a command, or via checking a certain port, etc, and, if desired, automatically restart them. It’s very easy to configure, and has a ton of examples on their wiki.