What you are sending to the GELF input is not properly formatted… I can’t tell anything else about what is going on though… you would need to post more information… It’s all a black box until you tell us what
you have, and how you are doing it. Posting text wherever possible is better than text in a picture.
NOTE: moved the post to Graylog Central where questions are asked.
Here are posts on how to ask questions in the forum…