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Occurrence list

The Occurrences card of a unit panel, the active and recent occurrence episodes of the unit.

View as Markdown

The Occurrence list shows the active and recent occurrence episodes of a unit (see Occurrences for what an occurrence is). It is a reading, not a command surface: nothing on it writes.

It is the Occurrences card of the unit panel, not a component: the panel draws it for its own unit wherever the model's Panels keep that card on. It is never placed on a screen, and the dashboard's Add palette does not offer it. There is nothing to configure: the list draws at most five episodes, the active ones first and the most recent after them, so the cap drops the oldest of what is over.

What a row shows

Each episode row carries:

  • the occurrence's name and its status word,
  • the Active clock: how long the condition has been (or was) in force,
  • when the episode ever lost its signal, a separate Signal loss clock (or Signal unavailable while the signal is still gone),
  • the episode's message, when it has one, with the full text in the row's tooltip.

While an episode is active, a band on the row's leading edge and its status word take the tone of the occurrence's severity, the same tone its dot has on the Occurrences timeline of Events: critical for Critical, caution for Warning, neutral for Info. A cleared episode is drawn plain, whatever its severity.

The two clocks are deliberately separate: an unavailable signal never makes an active occurrence look cleared.

States and refresh

The header says what the list is reading, and on the unit panel it is the card's own head: Occurrences during a run, Occurrences · 2 active while episodes are active, Occurrences · outside run while the unit has no run (the list then reads the episodes raised outside one), and Occurrences · unavailable where the episode reader is not running. The list refreshes about every two seconds. A failed refresh keeps the previous rows and marks the header · stale while the automatic retry is pending, rather than clearing a list the operator may be reading.