[improve][doc] Doducment dlq producerName (#735)

This PR adds doc for apache/pulsar#21589 Co-authored-by: Zike Yang <zike@apache.org> --------- Co-authored-by: Zike Yang <zike@apache.org>
apache · Nov 27, 2023 · 9746907 · 9746907
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commit 9746907
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diff --git a/docs/concepts-messaging.md b/docs/concepts-messaging.md
@@ -332,6 +332,13 @@ The default dead letter topic uses this format:
 ```
 <topicname>-<subscriptionname>-DLQ
 ```
+
+The dead letter producerName uses this format:
+
+```
+<topicname>-<subscriptionname>-DLQ
+```
+
 :::note
 - For Pulsar 2.6.x and 2.7.x, the default dead letter topic uses the format of `<subscriptionname>-DLQ`. If you upgrade from 2.6.x~2.7.x to 2.8.x or later, you need to delete historical dead letter topics and retry letter partitioned topics. Otherwise, Pulsar continues to use original topics, which are formatted with `<subscriptionname>-DLQ`.
 - It is not recommended to use `<subscriptionname>-DLQ` because if multiple topics under the same namespace have the same subscription, then dead message topic names for multiple topics might be the same, which will result in mutual consumptions.