This read-only gauge counts despool events, per the object's own description, in which the ring being tracked was found completely flooded on the transmit side. Like the receive-side clvRxRingFlooded counter, a nonzero and growing value here signals the outbound queue has genuinely run out of buffer headroom rather than just approaching it. For example, seeing this counter increase during a large outbound backup transfer would prompt the admin to check whether the interface's transmit capacity is being exceeded.