10. A system, comprising: an interface operable to: receive a measurement for a service; and one or more processors operable to: calculate a service level value from the measurement, the service level value calculated according to a formula; apply an aggregation rule to the service level value to yield an actual service level; compare the actual service level to a target service level of a Service Level Agreement; return an amount of deviation between the actual service level and the target service level; and calculate a penalty if the amount of deviation indicates the actual service level fails to meet the target service level, the penalty calculated from a penalty formula that includes the amount of deviation as an input.
13. The system of claim 10 , wherein: the aggregation rule includes an aggregation function selected from the group consisting of a sum, an average, a weighted average, a minimum, a maximum, and a count.