Enable log.format.json.fix_duplicate_message_fields by default - #16578

Release notes

Enable log.format.json.fix_duplicate_message_fields by default to avoid collision of the message field in log lines when log.format is JSON.

What does this PR do?

enable log.format.json.fix_duplicate_message_fields by default for v9

Why is it important/What is the impact to the user?

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files (and/or docker env variables)
• I have added tests that prove my fix is effective or that my feature works

Author's Checklist

• [ ]

How to test this PR locally

Related issues

• Closes: Enable log.format.json.fix_duplicate_message_fields by default #16354

Use cases

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