Hi, I am trying to use Fluent-Bit to log IIS log files to a HTTP source. I am using a Regex parser and can successfully extract named capture groups for all the details I wish to extract. My question is - is there a way to also send the complete log line as a JSON key as well as all the named capture groups JSON keys?

Use a secondary parser filter is probably the way to do it, that way you get by default the full line in tail and then you can parse it in second stage.

preserve_key

and

reserve_data

are the relevant options I think you want: https://docs.fluentbit.io/manual/data-pipeline/filters/parser You can also set to only parse it for certain outputs via a processor if that is helpful too.