读取rrd
https://github.com/h4wkmoon/collectd-nagios/blob/master/plugins/collectd.py
rrd画图
https://github.com/pommi/CGP
python-rrdtool
https://github.com/commx/python-rrdtool
nvd3
http://nvd3.org/examples/lineWithFocus.html
Nagdash
https://github.com/lozzd/Nagdash
nagios-api
https://github.com/zorkian/nagios-api
https://wiki.opnfv.org/display/fastpath/Collectd+Metrics+and+Events
