JAVA-2662: Document how to enable JMX connection pool monitoring

Author: jyemin

docs/reference/content/driver-async/reference/monitoring.md

@@ -33,6 +33,16 @@ application has multiple `MongoClient` instances connected to the same MongoDB s
 - `waitQueueSize`: the current size of the wait queue for a connection from this pool
 - `checkedOutCount`: the current count of connections that are currently in use
 
+JMX connection pool monitoring is disabled by default. To enable it add a `com.mongodb.management.JMXConnectionPoolListener` instance via 
+`MongoClientSettings`:
+
+```java
+MongoClientSettings settings =
+        MongoClientSettings.builder()
+        .applyToConnectionPoolSettings(builder -> builder.addConnectionPoolListener(new JMXConnectionPoolListener()))
+        .build();
+```
+
 # Command Monitoring
 
 The driver implements the

docs/reference/content/driver/reference/monitoring.md

@@ -33,6 +33,19 @@ application has multiple `MongoClient` instances connected to the same MongoDB s
 - `waitQueueSize`: the current size of the wait queue for a connection from this pool
 - `checkedOutCount`: the current count of connections that are currently in use
 
+
+JMX connection pool monitoring is disabled by default. To enable it add a `com.mongodb.management.JMXConnectionPoolListener` instance via 
+`MongoClientOptions`:
+
+```java
+MongoClientOptions options =
+        MongoClientOptions.builder()
+                .addConnectionPoolListener(new JMXConnectionPoolListener())
+                .build();
+
+
+```
+
 # Command Monitoring
 
 The driver implements the