The following documentation comment has been logged on the website:
Page: https://www.postgresql.org/docs/10/sql-dropsubscription.html
Description:
This page has a note about how to set the subscription to not use a slot,
but it doesn't mention that the subscription needs to be disabled first. In
my case, I had to Google around and then do:
ALTER SUBSCRIPTION xxx disable;
Then I could set the slot_name. Then I could drop it.
