This read-only PerfCounter64 counts probe-to-reflector available delta_ts, incrementing when FLR is at or below the availability threshold for 'n' consecutive delta_ts, per its description, as a distinctly named object alongside the similarly-behaved f3EsaProbeStatsSoamPmExtP2rAvailableTime. An administrator uses this figure the same way, as the outbound-direction availability count for the interval, when this particular SOAM PM extension object is the one exposed by their NMS integration. For example, a monitoring tool built against the standard Y.1731 SOAM-PM naming convention would poll f3EsaProbeStatsSoamPmExtP2rAvailableDeltaTs specifically rather than the vendor's AvailableTime alias.