This variable returns the cummulative count of number of rekey
messages and retransmits during the last cycle of rekey. This
count displays the information pertaining to Group Members only
(and is not related to any sync operation pertaining to peer Key
Servers). This information is a reflection of rekey operation on
a Primary Key Server, and is not available for Secondary Key
Server(s), because they do not perform rekeys and do not receive
any ACKs. While a rekey is in progress, this variable will give
information of the last rekey operation.