接口 Exporter

public interface Exporter

Generic interface for metric exports. As you scale up metric collection you will often need to buffer metric data locally and export it periodically (e.g. for aggregation across a cluster), so this is the marker interface for those operations. The trigger of an export operation might be periodic or event driven, but it remains outside the scope of this interface. You might for instance create an instance of an Exporter and trigger it using a @Scheduled annotation in a Spring ApplicationContext.