The search depth at which to stop looking for the
etsysTrackedObjectsProbeAcvReply within an ACV response. A
successful match may stop prior to this search depth, but an
unsuccessful match will not (unless the response from the server
contains fewer characters than the specified search depth).
This object MAY NOT be set when etsysTrackedObjectsProbeType is
either 'icmp' or 'icmpTs'.