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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