slotSamples
The machine's slots as the studio has seen them while it ran: a sample every five seconds (watchSlots), the last
half hour's, oldest first: how many there were, how many were held (by codebase), and how many slots work in line
waited for.
export const slotSamples: { at: number; size: number; held: number; waiting: number; byRoot: Record<string, number>; }[] = []