New format for expected

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
```
