New format for expected

[Nekmo]

Right now logic is to define what is the expected value.

observable.value = 3
observable.expected = <= 2

In the future it revert logic to define what is a problem.

observable.value = 3
observable.warning = >= 2

The goal is to have more than one trigger.

observable.value = 3
observable.warning = >= 2
observable.average = >= 5
observable.high = >= 8