Edge Stack API Gateway uses Envoy Proxy as its core L7 routing engine and provides a configurable access logging mechanism, which provides extensive information that can be used to troubleshoot issues. The Edge Stack API Gateway access log format includes various fields such as start time, method, protocol, response code, response flags, upstream service time, X-Forwarded-For, user agent, request ID, host, upstream host, and others, which can help identify the source of problems. The logs can be read using `kubectl logs` command, and further reading on access log configuration is available in Envoy Proxy documentation.