Configure Thresholds notifications

Problem:
Threshold notifications are not received

I am trying to set up a toner threshold notification in a printer.

I added a node (printer). Toner level is displayed correctly in the resource graph.

I went to the Threshold Configuration section
and created a threshold with the following values.

Then I followed the link

And configured a notification for the threshold

In one of the printers, the toner level dropped below the threshold, but I do not receive notifications that the toner level in the printer is low.
Notifications about other events (adding a node, a node deleted, and so on) arrive in the mail correctly.
What did I miss?
I would be grateful for any help.
Thank you so much.

OpenNMS version:
28.0

Are you seeing the HighThresholdExceeded3 events on the node? (Technically you’re making a low threshold with a label calling it high, but that doesn’t affect how this is working) First thing to verify is that the threshold is actually triggering (and resetting) properly.

Thank you very much for your reply. I would be very grateful if you tell me how can I check this?

The threshold is not displayed in Events

Do I need to reboot opennms?

Unfortunately, due to my carelessness, I made a mistake in describing the problem. It would be correct to say that thresholds are not displayed in events. Most likely they don’t even work.