esaProbeOperationalState is a read-only OperationalState value representing whether the ESA Probe is actually running its test right now. An administrator checks this to distinguish a probe that is merely configured from one that is genuinely up and generating SLA test traffic. For example, a probe left in an administratively enabled state but showing a disabled operational state tells the technician the probe failed to start, perhaps because its reflector or port is unreachable, and needs investigation before its statistics can be trusted.