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ActivityKit drops updates whose content state encodes to more than 4 KB, without an error. Libre sensors report every minute, so the activity carried the 100-sample cap plus the prediction line: about 5.4 KB in JSON, against about 3 KB for a G7. Every update was dropped and the activity stayed on the empty placeholder, showing 0.0 and "Open the app to update the widget" (#2456). Send the chart at most one point per ~5 minutes, keeping the latest. The current value and delta still use every sample.
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Fixes the Live Activity staying on "Open the app to update the widget" with 0.0 glucose when using Libre sensors (#2456).
Cause
ActivityKit drops any update whose content state encodes to more than 4 KB, and doesn't report an error. Libre sensors report every minute, so the activity was sending the 100-sample cap plus the prediction line:
Every update was dropped, so only the placeholder activity created on foreground was ever shown. This matches the next-dev report in #2456 that it started right after switching from G7 to Libre 3+.
Change
The Live Activity chart now gets at most one point per ~5 minutes (4.5 min spacing, keeping the latest). Thinned Libre data comes to ~3.0 KB, the same as a G7. The current value and delta still use every sample.
Testing
The Loop scheme builds. The sizes come from encoding equivalent structures with JSONEncoder. Not yet tried on a phone with a Libre sensor.