Alert Notifications
You can now get notified via email when your Linode crosses a specific threshold, for several statistics. Alerts are checked once per hour.
Currently, the available parameters are:

CPU usage (two hour average)

Disk IO-ops/sec (two hour average)

Network traffic rate in (two hour average)

Network traffic rate out (two hour average)

Monthly Transfer Quota (percentage)
You can enable/disable the alerts and set your threshold values from the
Alerts page, located off the
Utilities sub-tab of the members' site.