Currently the servers have to be separately defined for both the service and the monitor.

[Monitor1]

type=monitor

...

servers=Server1,Server2,Server3

[Service1]

type=service

...

servers=Server1,Server2,Server3

Since the set of servers is typically the same, this is both tedious and error-prone. By allowing a service to refer to a monitor, the servers of the service do not explicitly be listed but are defined by the monitor.

[Monitor1]

type=monitor

...

servers=Server1,Server2,Server3

[Service1]

type=service

...

monitor=Monitor1

This also makes it possible to allow the monitor to dynamically define the servers at runtime.