You can trigger units explicitly on failure with OnFailure=someservice as well (and since you can parameterize service names, you can have e.g. a single failure

You can trigger units explicitly on failure with OnFailure=someservice as well (and since you can parameterize service names, you can have e.g. a single failure@.service that'll do whatever you prefer once a service fails. OnFailure makes it easy to implement more complex restart or notification logic.