You didn't get any alert because your trigger expression uses function min with the parameter of 300 seconds.
That means that your item values have to be < 800M for 5 minutes and I can see in your graph that it does not happen, so everything is OK, you're not supposed to get any alert.
If you want to get an alert at any time your free memory gets < 800M you should use the function ".last(0)<800M".
That means that your item values have to be < 800M for 5 minutes and I can see in your graph that it does not happen, so everything is OK, you're not supposed to get any alert.
If you want to get an alert at any time your free memory gets < 800M you should use the function ".last(0)<800M".
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