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The Device Page
Settings, Devices and Services, Device Sentinel. What every row means, as of 0.3.12.
Scan and Enable Signal and Last-Seen Entities. Scans the entity registry for signal and last-seen entities that an integration shipped turned off, and turns them on so Device Sentinel can learn from them. Entities you disabled yourself are left alone. Last-seen entities are protocol truth, the most reliable clock a device can offer, so pressing this once strengthens future freeze detection.
Problem List. Device Sentinel's own todo list, one row per current finding. Checking a row acknowledges it; a finding that recovers removes its own row. Items you add yourself are left untouched. Empty until the detection families that populate it arrive.
Status. Watching, Learning, or Problem. Learning shows until the first device establishes its rhythm; Watching from then on; Problem if Device Sentinel's own storage is unhealthy. The setup count and install date ride as attributes.
Devices Watched. How many devices are being observed and learned. The split behind it (total, set aside, deviceless entities) rides as attributes.
Devices Learned. How many devices have an established rhythm, meaning enough learned days to be judged for freeze once freeze detection arrives. Not expected to reach Devices Watched: devices with no heartbeat, like buttons and remotes, never establish a rhythm and are never judged frozen, by design.
Battery Low Count. How many batteries are flagged low right now.
Battery Low List. The same count, with one row per flagged device in its attributes: name, entity, area, level, low-since. Built for dashboards; the row shape matches the Battery Sentinel blueprint.
Battery Low Threshold. The percentage at or below which a battery is flagged. The same setting as the slider on the Low Battery screen, surfaced here so the knob lives where the counts are seen.
Service Devices Ignored. Devices with no hardware to watch: service entries, cloud connections, integration containers. Device Sentinel classifies these out itself. This is not the exclude list; you did not choose these and they need nothing from you.
Since 0.3.12, in the form the names suggest: sensor.device_sentinel_devices_watched, sensor.device_sentinel_devices_learned, and so on. Installations from before 0.3.12 were migrated automatically, one logged rename per entity.
Device Sentinel is brought to you by James Lander at The Thinking Home. Read the story behind it: Reliable Home Assistant Dead Sensor Detection.
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Licensed under GPL-3.0-or-later. Copyright © 2026 James Lander.
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- How Device Sentinel Learns
- Maintenance Mode
- The Bridge and Broker Sensors
- What Is Recorded About Your House
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