Why is a high Sentinel bad?
Sentinel is the one score where higher is worse, and it is labelled that way wherever the number appears, so it is never read as a good result sitting next to Readiness. When it rises it names the signal that drifted, from your resting heart rate, your overnight HRV, your breathing rate and your skin temperature, and over how many nights. It may ease today's session back one step. It also separates three very different situations: the sensor is absent, your normal is still being learned, or a reading has not updated since a given date and today is repeating it. When the pattern goes away, it says so.
Sentinel compares you against your own overnight baseline. It is an observation, not a diagnosis, and the tiles say so. What Sentinel needs before it will fire, how often it is allowed to fire, and how often it actually has fired are all published on Settings > Help > How it works.
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