SilenceCause

Which gate is keeping the station quiet, or airing when none of them is. Ordered by cause: a stalled transport loop makes every reading under it stale, so it is ruled out first

type SilenceCause =
    | 'airing'
    | 'transportStalled'
    | 'controlDenied'
    | 'streamUnreachable'
    | 'configNotAdopted'
    | 'stoodDown'
    | 'noProgramme'
    | 'noAudience'
    | 'warmingUp'
    | 'waitingOnAudio'
    | 'notDriving'
    | 'starved';