docs(ports): adds a description of port 8443 used by KafkaAgent (#10570)

Signed-off-by: prmellor <[email protected]>

documentation/assemblies/security/assembly-security.adoc

@@ -50,11 +50,17 @@ image::secure_communication_zookeeper.png[Secure Communication]
 
 The ZooKeeper ports are used as follows:
 
-ZooKeeper Port (2181):: ZooKeeper port for connection to Kafka brokers.
+ZooKeeper port (2181):: ZooKeeper port for connection to Kafka brokers.
 Additionally, the Cluster Operator communicates with ZooKeeper through this port.
 ZooKeeper internodal communication port (2888):: ZooKeeper port for internodal communication between ZooKeeper nodes.
 ZooKeeper leader election port (3888):: ZooKeeper port for leader election among ZooKeeper nodes in a ZooKeeper cluster.
 
+.Node status monitoring using the `KafkaAgent` (8443)
+
+Strimzi includes a component called `KafkaAgent` that runs inside each Kafka node. 
+The agent is responsible for collecting and providing node-specific information, such as current state and readiness, to the Cluster Operator. 
+It listens on port 8443 for secure HTTPS connections and exposes this information through a REST API, which the Cluster Operator uses to retrieve data from the nodes.
+
 include::../../modules/security/con-certificate-authorities.adoc[leveloffset=+1]
 
 include::../../modules/security/ref-certificates-and-secrets.adoc[leveloffset=+1]