docs(inputs.mqtt_consumer): Clarify persistent session and topic refr…

…esh (#14366)
influxdata · Nov 30, 2023 · 9a851dc · 9a851dc
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diff --git a/plugins/inputs/mqtt_consumer/README.md b/plugins/inputs/mqtt_consumer/README.md
@@ -83,7 +83,9 @@ to use them.
   ## In order for this option to work you must also set client_id to identify
   ## the client.  To receive messages that arrived while the client is offline,
   ## also set the qos option to 1 or 2 and don't forget to also set the QoS when
-  ## publishing.
+  ## publishing. Finally, using a persistent session will use the initial
+  ## connection topics and not subscribe to any new topics even after
+  ## reconnecting or restarting without a change in client ID.
   # persistent_session = false
 
   ## If unset, a random client ID will be generated.

diff --git a/plugins/inputs/mqtt_consumer/sample.conf b/plugins/inputs/mqtt_consumer/sample.conf
@@ -46,7 +46,9 @@
   ## In order for this option to work you must also set client_id to identify
   ## the client.  To receive messages that arrived while the client is offline,
   ## also set the qos option to 1 or 2 and don't forget to also set the QoS when
-  ## publishing.
+  ## publishing. Finally, using a persistent session will use the initial
+  ## connection topics and not subscribe to any new topics even after
+  ## reconnecting or restarting without a change in client ID.
   # persistent_session = false
 
   ## If unset, a random client ID will be generated.