If you see your Particle devices flashing cyan with the occasional red burst, this is most likely due to some cloud issue and under active investigation.
Please be patient!
Update: Things seem to be getting back to normal now - still some delays but devices get online a lot quicker again.
Update: Services are up and running again since 15:00 UTC
Thanks to @jgoggins for ploughing through the logs and fixing the issue and thanks for all of your patience!