While freely acknowledging that I am biased because I wrote it, I am a bit
surprised to see the DSM registry left out of the release notes (commit
8b2bcf3, docs are here [0]). This feature is intended to allow modules to
allocate shared memory after startup, i.e., without requiring the module to
be loaded via shared_preload_libraries. IMHO that is worth mentioning.
[0] https://www.postgresql.org/docs/devel/xfunc-c.html#XFUNC-SHARED-ADDIN-AFTER-STARTUP
--
nathan