PMM-9403 Fix replication lag panel.#1572

BupycHuk merged 2 commits intomainpercona/grafana-dashboards:mainfrom

PMM-9403-add-extra-self-label-for-replicasetpercona/grafana-dashboards:PMM-9403-add-extra-self-label-for-replicasetCopy head branch name to clipboard