NewConfigFromFile creates a Config object and fills all config items according to the configuration file.

NewDefaultConfig creates a Config object which fills all config items with default value.

IngressClass is the default ingress class name, used for Ingress object's IngressClassName field in Kubernetes clusters version v1.18.0 or higher, or the annotation "kubernetes.io/ingress.class" (deprecated).

IngressAPISIXLeader is the default election id for the controller leader election.

DefaultLogLevel is the default log level for apisix-ingress-controller.

Config contains all config items which are necessary for apisix-ingress-controller's running.