Github user alficles commented on the issue:
https://github.com/apache/incubator-trafficcontrol/pull/327
@dangogh @rob05c Yeah, `docker-compose up` should build all the things. As
it stands, you'll get either a build failure or, worse, an unlabeled and
arbitrary traffic_monitor binary in the output. I would strongly consider
deciding which one is "mainstream" and either commenting out the build steps
for the other, or reconfiguring the build to put the other's binaries in a
different subfolder (which might be tricky).
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