DOCS-15526 connections rejected metric (mongodb#1600)

* DOCS-15526-connections-rejected-metric

* DOCS-15526-connections-rejected-metric

* DOCS-15526-connections-rejected-metric

* DOCS-15526-connections-rejected-metric

Co-authored-by: jason-price-mongodb <[email protected]>

Author: jason-price-mongodb

source/reference/command/serverStatus.txt

@@ -327,6 +327,7 @@ connections
       "current" : <num>,
       "available" : <num>,
       "totalCreated" : <num>,
+      "rejected" : <num>,  // Added in MongoDB 6.1
       "active" : <num>,
       "threaded" : <num>,
       "exhaustIsMaster" : <num>,
@@ -365,6 +366,14 @@ connections
    Count of **all** incoming connections created to the server. This
    number includes connections that have since closed.
 
+.. serverstatus:: connections.rejected
+
+   The number of incoming connections the server rejected because the
+   server doesn't have the capacity to accept additional connections or
+   the :setting:`net.maxIncomingConnections` setting is reached.
+
+   .. versionadded:: 6.1
+
 .. serverstatus:: connections.active
 
    The number of active client connections to the server. Active client

source/release-notes/6.1.txt

@@ -93,6 +93,12 @@ Starting in MongoDB 6.1, the :dbcommand:`serverStatus` command and the
 
        - :serverstatus:`network.listenerProcessingTime.durationMicros`
 
+   * - Addition to :serverstatus:`connections` document.
+     - New field that reports the number of incoming connections the
+       server has rejected.
+
+       - :serverstatus:`connections.rejected`
+
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