The app currently logs diagnostic events to ETW in various places. If we add certain flags to those events, the data is eligible to be sent as telemetry. (Whether it actually gets sent is controlled outside of Calculator--for example, there are lots of checks at the system level to ensure privacy settings are honored.)
Currently we set the "eligible for telemetry" flags only in official builds, so no telemetry gets uploaded while the app is in development. We already have this set up for the main TraceLogging provider, but we also need to do this for the AppLifecycle performance logging.
Remove LayoutAwarePage, SuspensionManager, and other suspend-resume handling code. SuspensionManager::SaveAsync and related methods weren't actually called anywhere. I didn't attempt to remove the serialize/deserialize code at the ViewModel layer, although much of that is likely not needed either.
We may decide we want to persist more state through a suspend-terminate-resume cycle (as the app might have done a long time ago). But if we decide we want that, we should not use a persistence mechanism that's closely coupled to frame navigation.
