A new, cluster-wide database of channel counters can be created
    with the COUNTERS CRDB command. The new database will have all
    counters zeroed except for the count of messages stored in each
    channel. Those counts will be determined by entries in the PMDF
    queue cache database. In addition, if an in-memory section for
    association and channel counters on this node does not already
    exist, it will be created as well.

    Once the on-disk, cluster-wide database exists, you may use
    the COUNTERS SYNCHRONIZE command to merge the information from
    the node-specific, in-memory cache of counters into the on-disk
    database.