beostat_get_last_multicast will get time of the last multicast request sent to the nodes. It is usually reserved for internal use.
The time in seconds since Epoch (00:00:00 UTC, January 1, 1970) of the last multicast request. If an error occurs it will return -1.
This function relies on the Beostat subsystem, which consists of the proc filesystem on the remote node, the sendstatsdaemon on the remote node, the recvstats daemon on the master node, and two shared memory files in the directory /var/shm. If any part of the system breaks down, this function could fail.