Comment 7 for bug 1624230

Has been reproduced on ~400-nodes environment:
from nailgun.app log: http://paste.openstack.org/show/596030/
from postgresql log: http://paste.openstack.org/show/596035/

[root@fuel ~]# ps aux | grep 25785
root 19595 0.0 0.0 112648 972 pts/2 S+ 12:09 0:00 grep --color=auto 25785
postgres 25785 0.3 0.1 340048 142576 ? Ss Jan16 33:28 postgres: nailgun nailgun 10.21.0.2(60143) idle
[root@fuel ~]# ps aux | grep 7371
postgres 7371 1.1 0.1 341064 147300 ? Ss Jan17 101:14 postgres: nailgun nailgun 10.21.0.2(33717) idle
root 19605 0.0 0.0 112652 972 pts/2 S+ 12:09 0:00 grep --color=auto 7371

Will try to reproduce with additional logging in postgresql:
postgresql::server::config_entry { 'log_statement':
      value => 'all',
}

postgresql::server::config_entry { 'log_line_prefix':
      value => '%t %c %x ',
}