As far as I know, PI Coresight's graphing components are not exposed for external use. In fact, they are just svgs built from scratch.
Highcharts seems to be promising. Here is a real-time plot demo: http://www.highcharts.com/demo/dynamic-update
It should handle irregular intervals: http://www.highcharts.com/demo/spline-irregular-time
It appears it can handle data gaps although I've never tried myself. http://stackoverflow.com/questions/23243386/highcharts-highstock-step-line-with-gaps
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Thanks for all the suggestions guys, looks like HiCharts is the one for us.