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Fluentbit breaking changes since 5.0.5 - 5.1.4 Retain_Metadata_In_Forward_Mode default set to true #12621
Description
Regarding the old pr in 5.0.5
PR: #11756
this pr caused fluentd to fail , until we specifically configure Retain_Metadata_In_Forward_Mode to false in our config file.
...logs - 026-10-21 06:19:31 +0000 [warn]: #1 skip invalid event:.....
Will appreciate if in future any mismatches with fluentd will be mentioned in the version Release notes.
Thanks.
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cosmo0920 commentedon Oct 21, 2026
We already sent a PR to recover the compatibility to Fluentd repo here:
fluent/fluentd#5411
But the core development team still refuses to release this feature on their stable version.
Could you open an issue with more detailed explanations?
Besides, even if specifying Retain_Metadata_In_Forward_Mode as On, this behavior should be considered as a bug so I'll take a look.
ryan65 commentedon Oct 21, 2026
Hi @cosmo0920
Just to clarify , I see your pr was merged into fluentd master , does that mean that in 1.20 fluentd can work both ways ?
cosmo0920 commentedon Oct 22, 2026
Yes, Fluentd v1.20 will support the both of the format of forward protocol v1.5 but the core developer still refuse to release v1.2.0.
I have no idea why.
ryan65 commentedon Oct 22, 2026
Hi @cosmo0920
I added an issue in fluentd repo , to request more information on when the fix is due to comeout .
They say , probably next week. :-)
fluent/fluentd#5568