Send fluentd logs to stdout and make fluent-bit ignore them by default

[aslafy-z]

Is your feature request related to a problem? Please describe.
Ease fluentd debugging

Describe the solution you'd like
To ease debugging of fluentd, send logs to stdout instead of a file.
Exclude them by default from fluent-bit collection.

Additional context
Related #1075

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions!

[pepov]

What would be a good way to implement this? How about having a dedicated label for marking certain pods for fluentbit to drop their messages?

[aslafy-z]

Fluentbit has the feature: see the K8S-Logging.Exclude option and the associated fluentbit.io/exclude annotation. I have it in production right now and its fine :)
https://docs.fluentbit.io/manual/pipeline/filters/kubernetes#kubernetes-annotations

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions!

[pepov]

Created a PR to make the fluentbit side flag enabled by default: #1395

Although this is a breaking change in theory, I don't think this would affect anyone negatively in practice. I think this is enough to introduce for now and make the changes on the fluentd side later together with improvements around the fluentd internal log handling.

[pepov]

This behaviour is now enabled with 4.3 and logs for fluentd and syslog-ng will be excluded by default in 4.4, so moving the issue to that milestone