This Gauge reports Far End Unavailable Seconds encountered during one specific historical 15-minute interval in the past 24 hours — real outage time the remote end experienced due to this device's outbound signal during that window. An admin cares because this pinpoints exactly which historical interval had real far-end-experienced downtime, directly useful for supporting or disputing an SLA credit claim tied to a specific reported outage time. For example, confirming a nonzero Far-End UAS count precisely at the interval matching a customer's reported disruption supports attributing that outage to this link's outbound direction.