Ingress Telemetry Is a Boundary You Must Test
A topology UI can pass synthetic tests and still misread production traffic at the first adapter.
telemetry
Separate Raw Sensor Data from Interpreted State
Presence, motion and occupancy are conclusions; retain enough underlying evidence to debug those conclusions.
Status Heartbeats Need Identity, Version and Health Context
A backend cannot manage a fleet from a last-seen timestamp alone.
Stale Telemetry Should Not Render as Healthy
A last-known-good value becomes misleading when the system does not show how old the evidence is.
Psychological Safety Improves Telemetry
Teams get better operational data when engineers can report weak signals and mistakes before they become outages.
A Green Dashboard Can Still Be Wrong
Reliability culture includes skepticism about stale, incomplete or semantically weak telemetry.
Wi-Fi Signal Needed a Fallback Path
The host collector originally relied on `iw`, but driver and interface behavior did not always expose the active connection signal consistently.