1. A method performed on a computer for reactive and deliberative service level management, comprising: providing a service over a network having a plurality of network components that support the service, wherein performance of the service depends on performances of the plurality of network components that support the service, and wherein the service has a state that represents whether the performance of the service meets or exceeds a service level identified in a service level agreement; extracting a plurality of component parameter values from the plurality of network components that support the service across a plurality of domains of the network using a plurality of sensors respectively coupled to the plurality of network components that support the service; monitoring the plurality of component parameter values extracted from the plurality of network components that support the service using a plurality of monitoring agents, wherein each of the plurality of monitoring agents are configured to monitor a subset of the plurality of extracted component parameter values in a respective one of the plurality of domains of the network, detect one or more intra-domain events in the respective domain as a function of the component parameter values monitored in the respective domain, and generate one or more intra-domain alarms in the respective domain as a function of the intra-domain events detected in the respective domain; correlating the intra-domain alarms that each of the plurality of monitoring agents generate in each of the respective domains of the network using an alarm correlation agent, wherein the alarm correlation agent is configured to correlate the intra-domain alarms generated in each of the respective domains of the network to generate one or more inter-domain alarms across the plurality of domains of the network; and analyzing causes of the intra-domain alarms generated in each of the respective domains of the network and the inter-domain alarms generated across the plurality of domains of the network using an enterprise management system, wherein the intra-domain alarms and the inter-domain alarms indicate one or more of a degradation or a potential degradation in the performance of the service relative to the service level identified in the service level agreement.