message: [terraform] Lock Grafana version
  v7 seems to break anonymous auth, lock to v6 for now.
  Closes:
  Approved by: sherry-x
diff: @@ -191,7 +191,7 @@ data "template_file" "ecs_monitoring_definition" {
  prometheus_image = "prom/prometheus:v2.9.2"
  pushgateway_image = "prom/pushgateway:v1.2.0"
  alertmanager_image = "prom/alertmanager:v0.17.0"
  - grafana_image = "grafana/grafana:latest"
  + grafana_image = "grafana/grafana:6.7.3"
  }
  }
  