Install Swift-Utilization with sudo python setup.py install or sudo python setup.py develop or via whatever packaging system you may be using.

Alter your proxy-server.conf pipeline to have swiftutilization:

[pipeline:main] pipeline = catch_errors cache swift3_gatekeeper swift3 s3token authtoken keystone swiftutilization proxy-server

! swift utilization middleware always located after auth middleware

Add to your proxy-server.conf the section for the swift utilization WSGI filter::

[filter:swiftutilization] use = egg:swiftutilization#swiftutilization sample_rate = 600