DOC-4512 RS: Add new reserved ports to 7.8.2 release notes

Author: rrelledge

content/operate/rs/release-notes/rs-7-8-releases/rs-7-8-2-tba.md

@@ -123,7 +123,16 @@ This version offers:
 
     - `replica_sync_connection_alarm_timeout_seconds`: if the syncer takes longer than the specified number of seconds to connect to a replica, raise a connection alarm.
 
-- Reserved port 3349 for the cluster watchdog exporter.
+- Reserved the following ports:
+
+    | Port | Process name | Usage | 
+    |------|--------------|-------|
+    | 3347 | cert_exporter | Reports cluster certificate metrics |
+    | 3348 | process_exporter | Reports process metrics for DMC and Redis processes |
+    | 3349 | cluster_wd_exporter | Reports cluster watchdog metrics |
+    | 3350 | db_controller | In charge of the module control plane |
+    | 9091 | node_exporter | Reports host node metrics related to CPU, memory, disk, and more |
+    | 9125 | statsd_exporter | Reports push metrics related to the DMC and syncer, and some cluster and node metrics |
 
 ### Redis database versions