expose mesos framework metrics

[liorchaga]

expose per each framework:
active
used resources
offered resources

[Brico87]

Hey ! Could your PR will also export the metrics associated to framework's tasks execution like describe in http://mesos.apache.org/documentation/latest/monitoring/#frameworks ?

[liorchaga]

@Brico87
Do you refer to the metric per framework, like master/frameworks/<ENCODED_FRAMEWORK_NAME>/<FRAMEWORK_ID>/subscribed?
My mesos clusters are running 1.5, this was introduced in 1.10, so will have to upgrade mesos first. So I can't promise it will be done soon (work priorities...). But will look into it, if there's good incentive for us to upgrade mesos might be able to push it.

[Brico87]

Yes indeed. I am talking about that.