galera/server/database/grafana.yml

parameters:
  _param:
    mysql_grafana_ssl_option: []
  mysql:
    server:
      database:
        grafana:
          encoding: utf8
          users:
          - name: ${_param:mysql_grafana_username}
            password: ${_param:mysql_grafana_password}
            host: '%'
            rights: all
            ssl_option: ${_param:mysql_grafana_ssl_option}
          - name: ${_param:mysql_grafana_username}
            password: ${_param:mysql_grafana_password}
            host: ${_param:cluster_local_address}
            rights: all
            ssl_option: ${_param:mysql_grafana_ssl_option}