Nut upsdev - Sep 2020 - Question about battery test / calibration

The UPS I am writing a driver to has the ability to inform that a variation
in the battery's capacity has changed, and therefore a
test.battery.start.deep or calibration.start has to be performed.

Is there a way -- appart from syslog -- for the driver to inform the
user/administrator that this  maintenance action has to be performed?

I would appreciate very much that my previous question if there are any
differences in the intended uses of test.battery.start.deep and
calibration.start. If there are no distinctions, I would also like to know
which one is preferred.

Thank you,
João Luis.
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