A new version of the ULFM specification accounting for remarks and discussions going on at the MPI Forum Meetings in September 2022 has been posted under the ULFM Specification item.
This new update has significant API changes that include a new API pair to control ANY-SOURCE messages (MPI_COMM_GET_FAILED/ACK_FAILED), and the introduction of implicit actions controlled by info keys users can set on communicators (as discussed on our research paper on the topic FTXS’22 Paper: Implicit Actions and Non-blocking Failure Recovery with MPI.
Head to ULFM Specification for more info.