@Override
        public BuilderTemplateDefinition builderTemplate() {
            return new BuilderTemplateDefinition(
                StorageBuilder.class.getName(), "metrics-builder");
        }
The default storage builder. Use {@link StorageBuilder} to provide general suitable entity builder
implementation, which deliver {@link HashMap} to storage module implementation.
oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/storage/StorageBuilderFactory.java