XiaoyiPeng opened a new issue #3728:
URL: https://github.com/apache/rocketmq/issues/3728
**BUG REPORT**
1. Please describe the issue you observed:
The **Uses of keys** entry in the document **Best practices** should be
better.
Users may be confused why the signature of method
`org.apache.rocketmq.common.message.Message#setKeys(String keys)` is `setKeys`
instead of `setKey`.

I think we should make this document more complete.
2. Please tell us about your environment:
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