httpRequest attribute of Stackdriver Output not working

[Wassim-AB]

Hello everyone :)

I have a log that is formatted like so :

{
   "asctime":"30/Jan/2024 08:46:17",
   "name":"app.middleware",
   "message":"endpoint was requested",
   "httpRequest":{
      "requestUrl":"/toto",
      "requestMethod":"GET",
      "status":404,
      "latency":"0.0004894733428955078s"
   },
   "severity":"INFO"
}

I managed to tell FluentBit that the field severity of my jsonPayload is the special Google Logging severity field using :

      [OUTPUT]
          Name                           stackdriver
          ....
          severity_key                   severity
          ....

I wanna do the same with the field httpRequest because it is also a special field of Google Logging. When looking at the code I noticed this attribute of the stackdriver output that surprisingly isn't documented, but still I came across this issue that mentions the field.

I tried using it with :

      [OUTPUT]
          Name                           stackdriver
          ....
          severity_key                   severity
          http_request_key               httpRequest
          ....

But when I do so, I cannot see my logs in Google Logging anymore. If I remove the http_request_key, I can see my log well parsed but without the httpRequest special field in the interface.

Is there something wrong with my configuration ? I can provide extra information if needed :)

Thank you !