On the other hand, I was just about to change the wal_debug behaviour to allow better debugging of PITR features as they're added.
That's a development activity. Enabling the WAL_DEBUG #ifdef by default during the 7.5 development cycle would be uncontroversial, I think.
I think it is very important to be able to put the system fairly easily into debug mode
It is? Why would this be useful for non-development activities?
(It may well be the case that we ought to report more or better information about the status of the WAL subsystem; but WAL_DEBUG is surely not the right mechanism for emitting information intended for an administrator.)
-Neil
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