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Enable debug log by command line https://projectcontour.io/docs/v1.10.0/troubleshooting/envoy-debug-log/
The envoy command has a --log-level flag that can be useful for debugging. By default, it’s set to info. To change it to debug, edit the envoy DaemonSet in the projectcontour namespace and replace the --log-level info flag with --log-level debug. Setting the Envoy log level to debug can be particilarly useful for debugging TLS connection failures.
Enable debug log by API 列出 logger 名字: