Graylog 3.3 is currently installed on logs0. Attempting to install the
*graylog-3.1-repository* package causes a transaction conflict, making
the task and playbook fail.
The *graylog* role installs Graylog from the *graylog2.org* Yum
repository and manages basic server configuration. It augments the
default systemd unit to provide the `CAP_NET_BIND_SERVICE` capability to
the Graylog server process via ambient capabilities, thereby allowing
the server to bind to the privileged Syslog UDP port.
