istio somehow overriding default access logging format of envoy
问题 As is very well explained in this elaborate answer, you can customise istio 's logging format in IstioOperator . In my case, IstioOperator (when it comes to access logging configuration) looks like this meshConfig: accessLogEncoding: JSON accessLogFile: /dev/stdout i.e. no accessLogFormat specified. However, in StackDriver , when seeing my istio-proxy logs, I see some fields NOT defined in the default format., e.g. here is a corresponding istio-proxy log entry response_code: "200" bytes