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FYI xssfox ended up developing a Amazon Web Service CloudWatch solution for monitoring the KiwiSDR status point. A screenshot of the tool and the files to do it are on github here: https://github.com/xssfox/kiwisdr-monitor
This does require familiarity with AWS however, but provides a very nice looking monitoring dashboard!
73, Mark VK5QI
Just as a bit more information on this one, here's a spectrogram plot from one of the KiwiSDRs over a few days, and also the estimated total RX power (just from summing all the bins). The scales are not quite matching, still some work to do there.
I'm not sure what the clipping point of the KiwiSDR is, or how accurate the RX Power estimate I'm doing is.
Anyway, the day/night cycles are clearly visible, and you can see those large red bands of shortwave stations that are causing me problems at some times!
EDIT: The code to capture the required data and generate the above plots is now on github here: https://github.com/darksidelemm/kiwisnr-rrd
73 Mark VK5QI