The nested class for
StatusChecker's names
registry= org.apache.dubbo.registry.status.RegistryStatusChecker
spring= org.apache.dubbo.config.spring.status.SpringStatusChecker
datasource= org.apache.dubbo.config.spring.status.DataSourceStatusChecker
memory= org.apache.dubbo.common.status.support.MemoryStatusChecker
load= org.apache.dubbo.common.status.support.LoadStatusChecker
server= org.apache.dubbo.rpc.protocol.dubbo.status.ServerStatusChecker
threadpool= org.apache.dubbo.rpc.protocol.dubbo.status.ThreadPoolStatusChecker