message: [tf] fix validator uptime metric
  Closes:
  Approved by: sherry-x
diff: @@ -25,7 +25,7 @@ yum install -y /tmp/node_exporter.rpm
  systemctl start node_exporter
  cat > /etc/cron.d/metric_collector <<"EOF"
  -* * * * * root docker container ls -q --filter label=vcs-upstream | xargs docker inspect --format='{{.State.StartedAt}}' | xargs date +"\%s" -d | xargs echo "ecs_start_time_seconds " > /var/lib/node_exporter/textfile_collector/ecs_stats.prom
  +* * * * * root docker container ls -q --filter label=vcs-upstream | xargs docker inspect --format='{{.State.StartedAt}}' | head -1 | xargs date +"\%s" -d | xargs echo "ecs_start_time_seconds " > /var/lib/node_exporter/textfile_collector/ecs_stats.prom
  * * * * * root docker container ls -q --filter label=com.amazonaws.ecs.container-name | xargs docker inspect --format='{{$tags := .Config.Labels}}build_info{revision="{{index $tags "org.label-schema.vcs-ref"}}", upstream="{{index $tags "vcs-upstream"}}", container_name="{{index $tags "com.amazonaws.ecs.container-name"}}"} 1' > /var/lib/node_exporter/textfile_collector/build_info.prom
  EOF
  