Pipeline Issue - set_fields w/ JSON not working

Graylog Central (peer support)
,
2

a really simple json parser is something like:

rule "extract-json"
when
    starts_with(to_string($message.message), "{") && ends_with(to_string($message.message), "}")
then
    let json = parse_json(to_string($message.message));
    let map = to_map(json);
    set_fields(map);
end

Not sure why this is not working in your case - from my knowledge it should.

Which Graylog version are you using?