We need DC/OS integration tests to verify the functionality of the new Mesos metrics module.
Since this is assigned to the Mesos team, this ticket tracks tests which cover parts of the test surface related to subtleties of the Mesos APIs.
Namely, we need tests to:
1) Verify that application metrics from standalone containers become available as expected
2) Verify that application metrics from services running as pods (task groups) become available as expected. Existing integration tests only verify this for command tasks.