We have a system where users should be alerted when different metrics goes outside of specified boundaries. The user should be able to configure these boundaries for each metric. There is a warning boundary and a critical boundary for each metric.
So for example, for the metric X (which in the normal case is 50) the user wants to have a warning alert when X > 60 or when x < 40 and a critical alert when X < 20 or X > 90. The critical range should be "outside" of the warning range.
We're having problems implementing an inuititive interface where the user configures these different alert ranges.
We've tried to implement this with a lot numerical inputs with lots of validation messages, but the interface gets messy and users have problems understanding the interface.
Any ideas of how to design this in a more intuitive way?