Updated InfluxDB/Grafana setup/import docs
See https://gitlab.com/gitlab-org/grafana-dashboards/merge_requests/1 for some background info.
cc @dblessing
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
See https://gitlab.com/gitlab-org/grafana-dashboards/merge_requests/1 for some background info.
cc @dblessing