In TiDB 2.0, Region health is monitored in the PD metric monitoring page, in which the Region Health monitoring item shows the statistics of all the Region replica status. miss means shortage of replicas and extra means the extra replica exists. In addition, Region Health also shows the isolation level by label. level-1 means the Region replicas are isolated physically in the first label level. All the Regions are in level-0 when location label is not configured.