As discussed at https://issues.jboss.org/browse/WFTC-78?focusedCommentId=13808486#comment-13808486 there was seen a wrong statistics being reported at a remote ejb calls for WFLY. The number of committed transactions went bigger than the number of all processed transactions.

This happens when the transaction consists of XAResource which announces to be read only during prepare call and with the second resource which is LastResource (https://github.com/jbosstm/jboss-transaction-spi/blob/master/src/main/java/org/jboss/tm/LastResource.java).
In such case the onePhaseCommit could be called during the BasicAction#prepare call (https://github.com/jbosstm/narayana/blob/5.10.0.Final/ArjunaCore/arjuna/classes/com/arjuna/ats/arjuna/coordinator/BasicAction.java#L2170).
In such case the statistics of committed transactions are increased during the onePhaseCommit method call and then during the phase2Commit at BasicAction#End call (https://github.com/jbosstm/narayana/blob/5.10.0.Final/ArjunaCore/arjuna/classes/com/arjuna/ats/arjuna/coordinator/BasicAction.java#L1529).