The group of wal_init_zero and wal_recycle is WAL_SETTINGS in guc.c, but their descriptions are located in "19.6. Replication"/"19.6.1. Sending Servers" section. This seems a documentation bug. They should be located in "19.5. Write Ahead Log"/"19.5.1. Settings". Thought?
+1
Why are there two settings for the same thing (COW support)?
Would we really want to allow setting one but not the other?