Just to let you know, if you refresh and rebuild your Fuchsia source, you'll now be able to
inspect the input event flow through the input pipeline. The available metrics are rudimentary
at the moment: we count the number of events seen, and record the timestamps at which they
happened. We could add more if you have a use case.
Use case for this change are bugs such as fxbug.dev/81262
where input events stop being delivered. Monitoring for changes in the input pipeline metrics enable us to
determine quickly whether an issue lies with the driver or with the input pipeline itself.