See my replies between the lines.

On 2016-04-19 12:13, Tom Laermans wrote:

Some other users happen to use successfully toner alerts with Observium?

Yup.

And now we are one of them! :)))

Here is the solution for anyone interested.
A few month earlier I found a github page with Observium alert checkers here: https://github.com/mgmoerman/docs/blob/master/observium-alert-checkers.md
Now I recalled it, and after checking it, I found that the correct name for the attribute is toner_current.
So with the condition: "toner_current lt 5" it works marvelously.
Actually we expanded it with an additional "

toner_current ne
      -3"

condition to exclude those stupid printers who are not able to tell sane values for such a simple question.

Ps: may I ask you to be a little more gentle with all those "stupid CE users"? Not all of them is using the CE version because s/he wants to buy beers on the money saved, and with time some/most of them are going to mature into "Professional users", so being gentle with them is an investment, even if it takes time/patience.

While you make a fair point (and I do kind of agree), Observium development is fairly fast-paced, and we all work with and on the current version which is several months ahead of CE. We simply can't remember all things that are and are not in CE which was released x time ago. It kind of works the 2 weeks after CE is released, then things are desync ;)

Yes, I'm fully aware of that.
Actually my question was (although not clearly formulated as such - sorry) more or less directed to some other users who are using alerting on toner level.

You need to hover the blue/white (i) icon *on an alert checker result* to get a popup giving you the metrics the alert checker found. If "measured" is empty it usually means you didn't specify a valid metric to check.

Yep, now the "Failed Tests" section appeared in the pop-up. This section was non-visible previously.

Anyway I hope my info above will be valuable for somebody.

And please keep up the work, I really appreciate your commitment, especially for providing the CE version and even support for it.

Best regards,
Tylla