An Errbit app is a place to collect error notifications from your external application deployments. Each one has a name and a unique API key that your notifiers can use to send notices to Errbit.
You may have many versions of an application running at a given time and some of them may be old enough that you no longer care about errors from those applications. If that's the case, set the LATEST APP VERSION field for your Errbit app, and Errbit will ignore notices from older application versions. Be sure your notifier is setting the context.version field in its notifications (see https://airbrake.io/docs/).
Normally when you visit the /problems page, you see the most recently received problems from all apps. Let's say you have a situation where you have three apps in the system: awesomeapp, noisy_app, and another_noisy_app. Further, let's assume that 99% of the problems come from noisy_app and another_noisy_app, and that you don't care about these apps for whatever reason. In this case, you could surf to the problems page and exclude the noisy apps from view like this: /problems?filter=-app:noisy_app%20-app:another_noisy_app
There is no UI for this feature, just the query param.