Re: recovery_target_action=pause with confusing hint

>> we should notice it in document I think. 

>There is the following explation about the relationship the recovery

>pause and the promotion, in the document. You may want to add more

>descriptions into the docs?

>------------------------------

>If a promotion is triggered while recovery is paused, the paused

>state ends and a promotion continues.

>------------------------------

For example we can add this words:

First-time pg_wal_replay_pause() called during recovery which triggered

as promotion, pg_wal_replay_pause() show success but it did not really

pause the recovery.