Collect InnoDB cluster status

[fredgate]

Feature suggestion : in order to be able to monitor InnoDB cluster with the exporter, it will be nice to know the status of each of the members in the cluster.
The above query allow to get topology of the cluster and state of each node :

SELECT
  REGEXP_SUBSTR(i.instance_name, '.+?(?=:)'),c.cluster_name as CLUSTER_NAME,
  i.*,
  rgm.*,
  IFNULL(rgm.MEMBER_STATE, 'OFFLINE') MEMBER_STATE_UPDATE,
  case rgm.MEMBER_STATE when 'ONLINE' then 0 when 'RECOVERING' then 1 else 2 end STATUS, case rgm.MEMBER_ROLE when 'PRIMARY' then 0 else 1 end ROLE
FROM
  mysql_innodb_cluster_metadata.clusters c
  INNER JOIN mysql_innodb_cluster_metadata.instances i ON c.default_replicaset = i.replicaset_id
  LEFT JOIN performance_schema.replication_group_members rgm ON i.mysql_server_uuid = rgm.MEMBER_ID
WHERE
  @@hostname = (SELECT MEMBER_HOST FROM performance_schema.replication_group_members WHERE MEMBER_ROLE = 'PRIMARY')"