How to push proxy error logs to the cloud logging in Apigee X?

[hsinghal]

I have been facing challenges while attempting to log proxy error responses into the cloud logging in Apigee X. Currently, only 200 responses are being logged successfully, while responses with 3XX, 4XX, and 5XX error codes are not captured.

I have tried various approaches but haven't been able to achieve the desired result. As I am setting up a critical production environment, it is crucial for me to address this issue on priority.

Any guidance or assistance in resolving this problem would be greatly appreciated.

Thank you in advance for your help!

Below is the message logging policy I'm using the post flow on my shared flows.

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<MessageLogging continueOnError="true" enabled="true" name="ML-CloudLogging">
  <DisplayName>ML-CloudLogging</DisplayName>
  <CloudLogging>
    <LogName>projects/{organization.name}/logs/apigee</LogName>
    <Message contentType="application/json">{
        "api_proxy_revision": "{apiproxy.revision}",
        "client.received.start.timestamp": "{client.received.start.timestamp}",
        "client.sent.end.timestamp": "{client.sent.end.timestamp}",
        "environment_name": "{environment.name}",
        "error_content": "{error.content}",
        "error_message": "{error.message}",
        "error_reason_phrase": "{error.reason.phrase}",
        "error_state": "{error.state}",
        "error_status_code": "{error.status.code}",
        "error_transport_message": "{error.transport.message}",
        "flow_name": "{current.flow.name}",
        "host": "{request.header.Host}",
        "http_method": "{request.verb}",
        "http_version": "{message.version}",
        "orgname": "{organization.name}",
        "protocol": "{request.header.X-Forwarded-Proto}",
        "proxy_base_path": "{proxy.basepath}",
        "proxy_client_ip": "{proxy.client.ip}",
        "proxy_name": "{apiproxy.name}",
        "proxy_pathsuffix": "{proxy.pathsuffix}",
        "proxy_url": "{proxy.url}",
        "query_param": "{request.queryparams.names}",
        "query_param_count": "{request.queryparams.count}",
        "query_param_value": "{request.queryparam.hello.values}",
        "request_formparams_count": "{request.formparams.count}",
        "request_formstring": "{request.formstring}",
        "request_headers_count": "{request.headers.count}",
        "request_header_content-length_values_string": "{request.header.Content-Length.values}",
        "request_header_content-type_values_string": "{request.header.Content-Type.values}",
        "request_path": "{request.path}",
        "request_querystring": "{request.querystring}",
        "request_uid": "{messageid}",
        "request_uri": "{request.uri}",
        "response_header_header_name_values_string": "{response.header.Content-Type.values}",
        "response_headers_count": "{response.headers.count}",
        "response_headers_names": "{response.headers.names}",
        "response_reason_phrase": "{response.reason.phrase}",
        "ssl_enabled": "{client.ssl.enabled}",
        "status_code": "{message.status.code}",
        "target_basepath": "{target.basepath}",
        "target_host": "{target.host}",
        "target_ip": "{target.ip}",
        "target_locality": "{target.locality}",
        "target_port": "{target.port}",
        "target_received_end_time": "{target.received.end.time}",
        "target_received_start_time": "{target.received.start.time}",
        "target_sent_end_time": "{target.sent.end.time}",
        "target_sent_start_time": "{target.sent.start.time}",
        "target_url": "{target.url}",
        "target_endpoint_name": "{route.target}",
        "uri_port": "{virtualhost.port}",
        "user_agent": "{request.header.User-Agent.values}"
    }</Message>
  </CloudLogging>
</MessageLogging>