[GitHub] [apisix] tzssangglass commented on issue #5512: bug: The kafka-logger plugin cannot collect the value of each nginx built-in variable correctly

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tzssangglass commented on issue #5512:
URL: https://github.com/apache/apisix/issues/5512#issuecomment-969859497


   here is my test:
   
   ```
     {
       "server_protocol": "HTTP/1.1",
       "@timestamp": "2021-11-16T12:28:39+08:00",
       "upstream_bytes_received": "528",
       "server_name": "_",
       "upstream_http_content_type": "application/json",
       "upstream_status": "200",
       "request_completion": "OK",
       "body_bytes_sent": "298",
       "upstream_addr": "198.18.2.225:80",
       "msec": "1637036919.270",
       "server_port": "9080",
       "route_id": "1",
       "upstream_uri": "",
       "request_method": "GET",
       "request_time": 0.426,
       "status": 200,
       "upstream_response_time": 0.426,
       "upstream_header_time": 0.426,
       "upstream_connect_time": 0.001,
       "upstream_scheme": "http",
       "bytes_sent": 526,
       "realip_remote_addr": "127.0.0.1",
       "remote_addr": "127.0.0.1",
       "host": "127.0.0.1",
       "uri": "/get",
       "http_user_agent": "curl/7.64.1",
       "request_uri": "/get",
       "request_length": 81,
       "upstream_http_content_length": "298",
       "scheme": "http",
       "upstream_host": "127.0.0.1:9080"
     }
   ```
   
   same as you, you can see that some of the data is not normal.
   
   I don't know why `request_time` , `upstream_response_time` and `upstream_connect_time` are 0 in your case.
   
   however, `request_time` and `upstream_response_time` may not be accurate, see https://stackoverflow.com/questions/53978695/how-can-request-time-be-less-than-upstream-response-time-in-nginx and https://github.com/apache/apisix/issues/5146
   
   if you want to get exact `upstream_response_time `, take a look at: https://github.com/openresty/openresty/issues/206#issuecomment-260101217
   
   these variables are not inherently accurate, I don't think this is a bug in the kafka-logger plugin, you need to do some calculations, like: https://github.com/apache/apisix/blob/718eb4b21efb2e640939f864441c5e84b7c46cad/apisix/plugins/prometheus/exporter.lua#L147-L164
   


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