[MESOS-6831] Add metrics for `slave` libprocess' event queue

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: agent
• Labels: metrics monitoring
• Assignee: Zhitao Li
• Reporter: Zhitao Li
• Created: 21/Dec/16 23:01
• Updated: 21/Jul/17 08:48

Description

We have event queue metrics for master and allocator in http://mesos.apache.org/documentation/latest/monitoring/, but we don't have the event queue length for the most important libprocess actor in agent `slave`.

I propose we add similar metrics to this actor. This is at least useful in debugging the issues of whether Mesos agent is overloaded.