How to monitor specific port speed

Tags: #<Tag:0x00007f3b8263e998>

Please help, what I am doing wrong?
I want to monitor when port switch from 1Gbit to 100Mbit speed

In events it looks like this:

2020-09-14 17:05:14 gi17 ifSpeed: 1000000000 -> 100000000 System
2020-09-14 17:05:14 gi17 ifHighSpeed: 1000 -> 100 System

What I am doing wrong that alerts not working?

First I see is, from your events picture, interface is gi17 and not ge17. Could that be de issue?

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Shame on me … one letter from solution! Thank you for kick!