Set of replicated state variables only one currently on the 8.0.17 version of this still exists, the future will be discarded, we in single master mode, can be used to see which node is read and write nodes.
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Server version: 8.0.17 MySQL Community Server - GPL
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Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql> show status like 'group_replication_primary_member'; +----------------------------------+--------------------------------------+ | Variable_name | Value | +----------------------------------+--------------------------------------+ | group_replication_primary_member | 1fb894d8-e752-11e9-a0a1-00505687032a | +----------------------------------+--------------------------------------+ 1 row in set (0.00 sec) group_replication_primary_member Shows the primary member's UUID when the group is operating in single-primary mode. If the group is operating in multi-primary mode, shows an empty string. The group_replication_primary_member status variable has been deprecated and is scheduled to be removed in a future version.