Cherry-pick #23954 to 7.x: Add RFC5424 format support for syslog input #25116
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Cherry-pick of PR #23954 to 7.x branch. Original message:
What does this PR do?
Reopen from #20246
Resolves #6872
Add RFC5424 format support for syslog input
Why is it important?
Syslog input only support rfc3164, btw rfc3164 is obsoleted by rfc5424
More and more software is using rfc5424 instead of rfc3164.
Checklist
CHANGELOG.next.asciidoc
orCHANGELOG-developer.next.asciidoc
.Author's Checklist
How to test this PR locally
Related issues
closes # #6872