fmt.Sprintf("Comma-separated minimum per-logger level of messages to output, in the form of"+
			" [<logger>:]<level>,[<logger>:]<level>,... or <level> to change all active loggers, "+
			"where logger components can be listed by running \"istioctl proxy-config log <pod-name[.namespace]>\""+
			"or referred from https://github.com/envoyproxy/envoy/blob/main/source/common/common/logger.h, and level can be one of %s", levelListString))