Background: I'm trying to debug an issue in which, sometimes, a record that is deleted on the provider does not get deleted on some of the consumers.
Ooh, my favorite kind of syncrepl bug. And you're even using a slog! I haven't noticed any of these in a while...doesn't mean they're not there...
Which loglevel keyword (if any) will allow me to see this synchronisation cookie being passed?
None off the shelf, I don't think, except for packet trace (a bit too heavy). Try
http://cvs.rutgers.edu/cgi-bin/viewcvs.cgi/*checkout*/source-patches/openlda...
(that's Howard's code, not mine). Despite the name, it applies clean to 2.3.32.