[Nut-upsuser] Setting up charge/voltage based shutdowns

[Jim Klimov]

Hello all again,

  While looking at https://github.com/networkupstools/nut/issues/2014 I
understood that I am
not sure if currently NUT has a standard way of triggering a shutdown based
on remaining charge
or runtime, if a device/driver lacks a `battery.charge.low` setting but has
readings for the values
themselves.

  Such an ability rings a bell to me, but maybe it is specific to some
drivers and is not
something ubiquitous - as being in the driver (and/or upsmon/upssched?)
core codebase?

  So there are a few questions stemming from this:
* Can a user currently (on NUT 2.8.0) set up battery percentage based
shutdowns
  when the "low" variable is missing in the driver/device? (Suggestions in
the ticket
  linked above are welcome)
* Does it make sense to add something like this (if missing) to be
consistent on
  un-capable devices? Or is it already there but too buried in code or docs?
* Would anyone step up to make this setup easy for newcomers (even if it
means "just"
  finding a chapter in the docs/FAQ and making it better exposed, perhaps
in the Wiki),
  or more so if design and coding are due? ;)

Jim
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