1. A computer-implemented method, comprising: under the control of one or more computer systems that execute instructions, providing an interface to a customer device connected to the one or more computer systems, the interface allowing the customer device to specify an alarm and omitting details about at least one condition for triggering the alarm; receiving, via the interface from the customer device, a request to monitor a plurality of virtual machine instances associated with the customer device and hosted by the computing resource service provider; monitoring performance of the plurality of virtual machine instances for an occurrence of the at least one condition; detecting the occurrence, at a virtual machine instance, of the at least one condition; and implementing the alarm.