This is pretty much the same stuff as `resolvectl monitor` does, and allows us to run `busctl monitor` in a Type=notify unit which ensures that `busctl` is really listening for messages once the unit is marked as started.
This is pretty much the same stuff as `resolvectl monitor` does, and allows us to run `busctl monitor` in a Type=notify unit which ensures that `busctl` is really listening for messages once the unit is marked as started.