MID Server extensions MID Server extensions provide data collection functionality that is resident on the MID Server. MID Server Extensions provide a new class of data collector for Discovery. Unlike a probe that runs a command and then terminates, a MID Server extension runs as long as it is enabled, which allows the MID Server to constantly listen for traps and events in the local environment. Only pertinent information is sent back to the ServiceNow instance, so data processing is more efficient and the CMDB data is updated as your environment changes. MID Server extensions are optional components that you may start or stop at any time. If a MID Server is restarted, the extensions running on the MID Server are also restarted. The following MID Server extensions are available: vCenter event collectorThe vCenter event collector is a MID Server extension that listens for vCenter-related events.SNMP Trap Collector ExtensionThe SNMP trap collector is a MID Server extension that listens for SNMP traps from the devices on your network.