I believe I found the issue, I was using a preview version of the metrics collection, that is why I had that problem.
As soon as I disabled, I could create the alerts.
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I enable the vm insights in a machine, I created a log analytics workspace, data collection rule with performance counters and add the machine on the collection rule resources.
The AMA agent was installed successfully, apparently everything is good, but when I try to create an alert, is not appearing the guest OS metrics. As you can see on the screenshot, just the platform metrics is appearing. Any clue? Thanks,
I believe I found the issue, I was using a preview version of the metrics collection, that is why I had that problem.
As soon as I disabled, I could create the alerts.