At present the input plugin is missing some metrics. We should round up all the metrics available from mesos_exporter (including those still on the framework-offers branch) as well as allocator metrics.
Note that the mesos_exporter code is exceptionally inefficient (everything is done via mutually exclusive regular expression match against the label); we should improve on this.
The outcome of these changes is that there should be no need to run mesos_exporter on a DC/OS cluster.
This code should eventually be contributed back up to the Telegraf repository in the influxdata organisation. However, this ticket may be considered done if the code is only in the dcos organisation, as long as another ticket tracks progress on contributing that code upstream.