[mesos] branch master updated: Updated `docs/monitoring.md` for new agent event queue metrics.

[jpeach]

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The following commit(s) were added to refs/heads/master by this push:
     new a4df260  Updated `docs/monitoring.md` for new agent event queue 
metrics.
a4df260 is described below

commit a4df2605753269f5c04bd30686729b5fd80eb66f
Author: Zhitao Li <zhitaoli...@gmail.com>
AuthorDate: Sun Jun 16 15:35:17 2019 -0700

    Updated `docs/monitoring.md` for new agent event queue metrics.
    
    Review: https://reviews.apache.org/r/54987/
---
 docs/monitoring.md | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/docs/monitoring.md b/docs/monitoring.md
index 027580f..364ca76 100644
--- a/docs/monitoring.md
+++ b/docs/monitoring.md
@@ -2262,3 +2262,35 @@ completed CSI calls made to the plugin.
   <td>Counter</td>
 </tr>
 </table>
+
+#### Event queue
+
+The following metrics provide information about different types of events in 
the
+event queue.
+
+<table class="table table-striped">
+<thead>
+<tr><th>Metric</th><th>Description</th><th>Type</th>
+</thead>
+<tr>
+  <td>
+  <code>slave/event_queue_dispatches</code>
+  </td>
+  <td>Number of dispatches in the event queue</td>
+  <td>Gauge</td>
+</tr>
+<tr>
+  <td>
+  <code>slave/event_queue_http_requests</code>
+  </td>
+  <td>Number of HTTP requests in the event queue</td>
+  <td>Gauge</td>
+</tr>
+<tr>
+  <td>
+  <code>slave/event_queue_messages</code>
+  </td>
+  <td>Number of messages in the event queue</td>
+  <td>Gauge</td>
+</tr>
+</table>