Discovery has dashboard which track the success and user flow of search in the apps at http://discovery.wmflabs.org/metrics/#app_events. In order for this dashboard to contain correct data, it needs to be actively maintain. That means that whenever any new actions are added to the schemas in the apps, or other major changes are made, a quick heads-up to Discovery would be appreciated so that we can update the dashboards.
So that the above is more likely to happen, let's add a small comment in the search-related eventlogging classes in the iOS and Android apps (WMFSearchFunnel.m and SearchFunnel.java, respectively) so that anyone changing the code (e.g. updating schema revision #) is more likely to contact us.