I have several Python scripts that output metrics to rrd formatted files. Although I have been using rrdtool for graphing, I am wondering if there is any simple way that I can directly graph rrd files in Grafana.
I have found a few possibilities but they seem to require the rrd files to have been generated through Cacti or OpenNMS.
Graphite http://graphiteapp.org supports reading data from rrd files, you will want to symlink the folder containing your rrd files to an rrd folder in the Graphite storage dir, then you'll be able to query them via Grafana with all the capabilities of the Graphite API.