GCP OPS agent transfer nginx log to cloud logging problem

Question

I followed this link steps to configure nginx.conf and the config.yaml of google-cloud-ops-agent. https://cloud.google.com/stackdriver/docs/solutions/agents/ops-agent/third-party/nginx After finished, I can see the result in cloud logging by using KQL. However, the fields in nginx log couldn't convert to JSON format.

Just like the following:

nginx original access log: {"requestMethod":"GET","status":"200","remoteIP":"192.168.134.2",.....}

GCP cloud logging show the result after transfer:

JsonPayload :{ message:"{"requestMethod":"GET","status":"200","remoteIP":"192.168.134.2",.....}" }

The result which I expect should be like this in cloud logging:

JsonPayload :{ requestMethod :"GET", status :"200", remoteIP :"192.168.134.2", ... }

So I don't understand what the problem is. Can you help me to give me some tips?

thanks!

[ops config.yaml][1]enter code here [ngnix log data][2] [cloud logging current result ][3] [1]: https://i.stack.imgur.com/aLwm9.png [2]: https://i.stack.imgur.com/Zj2J4.png [3]: https://i.stack.imgur.com/uHxBu.png