New creates a new instance of FiberPrometheus middleware serviceName is available as a const label.

NewWith creates a new instance of FiberPrometheus middleware but with an ability to pass namespace and a custom subsystem Here serviceName is created as a constant-label for the metrics Namespace, subsystem get prefixed to the metrics.

NewWithLabels creates a new instance of FiberPrometheus middleware but with an ability to pass namespace and a custom subsystem Here labels are created as a constant-labels for the metrics Namespace, subsystem get prefixed to the metrics.

NewWithRegistry creates a new instance of FiberPrometheus middleware but with an ability to pass a custom registry, serviceName, namespace, subsystem and labels Here labels are created as a constant-labels for the metrics Namespace, subsystem get prefixed to the metrics.