接口 BrokerEntryMetadataInterceptor

所有已知实现类:
AppendBrokerTimestampMetadataInterceptor, AppendIndexMetadataInterceptor

@LimitedPrivate @Stable public interface BrokerEntryMetadataInterceptor
A plugin interface that allows you to intercept the client requests to the Pulsar brokers and add metadata for each entry from broker side.