I tried to upgrade ovirt to version 4.1 from 4.0 and got:

          Found the following problems in PostgreSQL configuration for the Engine database:

           autovacuum_vacuum_scale_factor required to be at most 0.01

           autovacuum_analyze_scale_factor required to be at most 0.075

           autovacuum_max_workers required to be at least 6

           Postgresql client version is '9.4.8', whereas the version on XXX is '9.4.11'. Please use a Postgresql server of version '9.4.8'.

          Please set:

           autovacuum_vacuum_scale_factor = 0.01

           autovacuum_analyze_scale_factor = 0.075

           autovacuum_max_workers = 6

           server_version = 9.4.8

          in postgresql.conf on 'XXXX'. Its location is usually /var/lib/pgsql/data , or somewhere under /etc/postgresql* .

I'm a little afraid about that. Does ovirt want pg to lies about it's version ? It's a shared instance so what about other tools that access it ? Is there some explanation about the meaning of those values ?

And it was not in the release notes, it's not funny to get this warning after starting the upgrade

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