Add FilterGrep in Banzai Logging FluentbitSpec

[ltartarini]

Hi *,

Is there any chance to have the FluentBit Filter Grep (https://docs.fluentbit.io/manual/pipeline/filters/grep) into the FluentbitSpec of the Banzai Logging module? So far I see only the following FluentBit filters (https://kube-logging.dev/docs/configuration/crds/v1beta1/fluentbit_types):

FilterKubernetes
FilterAws
FilterModify
FilterModifyRule
FilterModifyCondition
It can be helpful, for example, to exclude logs before passing them to Fluentd.

https://github.com/orgs/kube-logging/discussions/1642

Thanks in advance,

Luca Tartarini