This is triggered when the value of a variable changes or reaches a certain value.
The name of the variable to query.
The type of comparison to perform. Options are:
- equal to - the variable matches the specified value
- rises above - the variable has just risen above the set value
- falls below - the variable has just fallen below the set value
- changes - the value of the variable changes in any way
The value to perform the comparison against.
Note that the value is not required if the comparison is set to changes.