Pipllines and the grok-function

Hello,
I might be able to help but I’m not that great in pipelines.
From what I seeing in your error…

I think it maybe something with this let val = From what I glanced at other posts perhaps it suppose to be just

grok( pattern:"%{WORD:part_1) %{WORD:part_2)", value:to_string($message.message));

Have after looking at this maybe a comma between…

pattern:"%{WORD:part_1), %{WORD:part_2)",

So I looked here and was unable to see this function let val=

https://docs.graylog.org/docs/functions

When you created this pipeline/rule you can test it out in the Simulator. Have you tried that? Then you can change the results if you wish.

I did a quick search for this situation maybe some of this posts perhaps have hints within them that may help.