The power-status-changed event is generated by the Upstart init(8) dae-
mon when it receives the SIGPWR signal, this has been typically gener-
ated by UPS monitoring software such as powstatd(8)
This event is not handled in the default Upstart configuration.
A task to be run on change of power status might use:
start on power-status-changed
Upstart 2009-07-09 power-status-changed(7)
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