New Relic Platform Installer (NPI) を入れたらログにエラーが..
$ vim /var/log/newrelic/nrsysmond.log
2016-01-05 15:44:15.380 (5401) error: Docker GET from 'http://localhost/info' failed
2016-01-05 15:45:15.381 (5401) error: Docker GET from 'http://localhost/info' failed
直すにはdisable_dockerを追記
$ vim /etc/newrelic/nrsysmond.cfg
disable_docker = true
サービスを再起動
sudo /etc/init.d/newrelic-sysmond restart
で、消えました
参考：
Docker GET from localhost failed – logs – Server Monitoring – New Relic Community Forum
