[Nut-upsuser] battery not installed, but battery still 100% and NUT 2.7.2-4 does not catch this and report a error

[Jim Klimov]

Hello all,

  While investigating some outstanding issues still labelled as being for
NUT v2.8.3 release, I stumbled upon
https://github.com/networkupstools/nut/issues/415 and thread
https://alioth-lists.debian.net/pipermail/nut-upsuser/2017-April/010591.html
(unfortunately it is not in my mailbox, so I can't reply to the old
thread), which raised a few distinct points, including:

* Lack of "ALARM" handling in `upsmon` and other notifications - that is
now addressed via https://github.com/networkupstools/nut/pull/2658
* Lack of notification about not-handled status tokens - should be logged
as part of https://github.com/networkupstools/nut/pull/2709 (but no
notification for those "OTHER" tokens as such yet - subject to change in
this or later PR)
* Presence of unknown tokens - raised a discussion in nut-upsdev and issue
https://github.com/networkupstools/nut/issues/2708
* Lack of RB token in ups.status => upsmon REPLBATT notification, when we
saw "No battery installed!" - another part of
https://github.com/networkupstools/nut/pull/2709 should now set the status
flag as well as the alarm message (so two notifications may happen by
different triggers... better safe than sorry).

So while it took 7 years to bubble through the backlog (with a PoC by
Arnaud made almost instantly), there is now some closure to that discussion
- and hey, it spawned some others :)

Cheers,
Jim Klimov
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