Going through the exercise of confirming short-circuit reads turns out to be quite a chore. 2.3.0 added a new metric, but metrics only get tickled when there's traffic that happens to use the feature. This is not very convenient for an operator who has taken a cluster out of service for maintenance.
It would be nice if the rs process could perform some test and emitted some confirmation of the status of this otherwise transparent feature. After confirmation, it could light up a boolean metric value and/or add mention of it to the info page.