add json format support for traefik logs

cmd/traefik/configuration.go

@@ -153,6 +153,12 @@ func NewTraefikDefaultPointersConfiguration() *TraefikConfiguration {
 	var defaultEureka eureka.Provider
 	defaultEureka.Delay = "30s"
 
+	// default TraefikLog
+	defaultTraefikLog := types.TraefikLog{
+		Format:   "common",
+		FilePath: "",
+	}
+
 	// default AccessLog
 	defaultAccessLog := types.AccessLog{
 		Format:   accesslog.CommonFormat,
@@ -177,6 +183,7 @@ func NewTraefikDefaultPointersConfiguration() *TraefikConfiguration {
 		DynamoDB:      &defaultDynamoDB,
 		Retry:         &configuration.Retry{},
 		HealthCheck:   &configuration.HealthCheckConfig{},
+		TraefikLog:    &defaultTraefikLog,
 		AccessLog:     &defaultAccessLog,
 	}