After fresh deployment of OSP13 with tripleo (using command line, containers images prepare/overcloud deploy style)
I've noticed that /var/log/zaqar/zaqar.log file is filling with messages like, one every hour it seems:

> 2018-01-24 18:00:02.703 1619 ERROR zaqar.transport.wsgi.v2_0.messages [req-a8e13d9c-af48-44f5-acf9-f2ba391f336c a94154226d5e42cba4f283d6d6f4743d 3e3dbdf4197340ec8eb9e94adf2a9415 - default default] Queue tripleo-ui-logging does not exist for project 3e3dbdf4197340ec8eb9e94adf2a9415: QueueDoesNotExist: Queue tripleo-ui-logging does not exist for project 3e3dbdf4197340ec8eb9e94adf2a9415
> 2018-01-24 18:00:02.703 1619 ERROR zaqar.transport.wsgi.v2_0.messages Traceback (most recent call last):
> 2018-01-24 18:00:02.703 1619 ERROR zaqar.transport.wsgi.v2_0.messages   File "/usr/lib/python2.7/site-packages/zaqar/transport/wsgi/v2_0/messages.py", line 105, in _get
> 2018-01-24 18:00:02.703 1619 ERROR zaqar.transport.wsgi.v2_0.messages     project_id)
> 2018-01-24 18:00:02.703 1619 ERROR zaqar.transport.wsgi.v2_0.messages   File "/usr/lib/python2.7/site-packages/zaqar/common/pipeline.py", line 97, in consumer
> 2018-01-24 18:00:02.703 1619 ERROR zaqar.transport.wsgi.v2_0.messages     tmp = target(*args, **kwargs)
> 2018-01-24 18:00:02.703 1619 ERROR zaqar.transport.wsgi.v2_0.messages   File "/usr/lib/python2.7/site-packages/zaqar/storage/sqlalchemy/queues.py", line 69, in get_metadata
> 2018-01-24 18:00:02.703 1619 ERROR zaqar.transport.wsgi.v2_0.messages     raise errors.QueueDoesNotExist(name, project)
> 2018-01-24 18:00:02.703 1619 ERROR zaqar.transport.wsgi.v2_0.messages QueueDoesNotExist: Queue tripleo-ui-logging does not exist for project 3e3dbdf4197340ec8eb9e94adf2a9415
> 2018-01-24 18:00:02.703 1619 ERROR zaqar.transport.wsgi.v2_0.messages 

Not sure what impact of that is (did not caused any trouble issue for me it seems),
although it's recorded as ERROR and with traceback seems as bug to me.

Also the uuid of missing queue is uuid of 'admin' project:
> $ openstack project list
> +----------------------------------+------------------------------------------------------------------+
> | ID                               | Name                                                             |
> +----------------------------------+------------------------------------------------------------------+
> | 3e3dbdf4197340ec8eb9e94adf2a9415 | admin                                                            |
> | be379b4a02de4e8a8178ad345bd0f25e | 3e3dbdf4197340ec8eb9e94adf2a9415-a48fc8f2-a841-4057-81e2-25093c9 |
> | f6f0e4f2c6d549498f7519c6ee492089 | service                                                          |
> +----------------------------------+------------------------------------------------------------------+



Not sure from where these requests are comming, so some of installed packages:
> openstack-tripleo-common.noarch           8.3.1-0.20180103233643.el7ost              @rhelosp-13.0-puddle
> openstack-tripleo-heat-templates.noarch   8.0.0-0.20180103192341.el7ost              @rhelosp-13.0-puddle
> openstack-tripleo-ui.noarch               7.4.3-4.el7ost                             @rhelosp-13.0-puddle
> openstack-zaqar.noarch                    1:6.0.0-0.20171229101800.764bbb9.el7ost    @rhelosp-13.0-puddle
> puppet-zaqar.noarch                       12.1.1-0.20171226064209.d7796e9.el7ost     @rhelosp-13.0-puddle
> python2-zaqarclient.noarch                1.8.0-0.20171221131422.a2bc819.el7ost      @rhelosp-13.0-puddle