Health and heartbeats
What fleet health shows, and what each state means.
States
| State | What it means |
|---|---|
| Held | The lane was braked on purpose. It reads held, not broken. |
| Quiet for no reason | The lane went silent without being braked. It raises its hand. |
| Unknown | The platform could not read the signal. Unknown is never shown as healthy. |
Heartbeats and alerts
Heartbeats run on every worker and service. Alerts fire on a change of state, not on a timer. The briefing tells operators what moved, what is stuck and what is waiting on them.