Getting _grokparsefailure as a tag

Hi

I've tried your suggestion and after some tweaks i got it to work as i wanted, well almost. I've just have one question how can i get the severity level in dissect? As for now I get the PRI correctly, but I want to "translate" or somehow get the correct log level. Should I use Grok for this? Or is there some way in dissect?
Once again thank you Badger for the reply and the help this far!