Document URL:
https://access.redhat.com/documentation/en/red-hat-update-infrastructure/3.0.beta.1/paged/system-administrator-guide/chapter-1-about-red-hat-update-infrastructure#idm140588578698160

Section Number and Name: 
Figure 1.1. Red Hat Update Infrastructure Overview

Describe the issue:
AFAIK, RHUA is not a Gluster node (may be shown as a client?) and
only CDSes are although the diagram shows so.

Suggestions for improvement:
It should make it clear that which servers are Gluster nodes.

Additional information:
In addition, it should be easy to understand if the lines explain communication path between servers have arrow to indicate the direction of each communication.