What if a connected device stops sending?

Trailwise tells you instead of quietly going blank. Because one source owns each stream, a source that goes quiet takes its signals down with it, and readings your other devices send for those streams are set aside. You get a warning in Action inbox (the bell), on Data health and on Settings > Your data, naming the source, the streams, the last date it sent and how long ago, with a button to hand those streams to another source. When a connection stops working altogether, you also get an email; if several stop close together, one email covers them all. The readings themselves say so too: a reading affected by a silent source names the source and the date and links straight to that source's own settings.