True but in practice it doesn't really matter. With sensu, you have offbox checks, and you just pick some internal server (there's always some "misc" server hanging around).

What matters is that the alert about the issue is raised and relayed to the proper notification channels. Since sensu doesn't concern itself with a fancy dashboard, it doesn't really matter if the alert pertains to the host or not.

Any decent monitoring will have customized the alert handling based on what's alerting, so there's some amount of post-processing possible.