I have a couple of questions before providing guidance:
Can you provide a bit more details about the user's user privileges who set up stack monitoring? (ex: what features does the user have enabled, what role permissions do they have, etc.)
Was the alert running successfully previously and suddenly stopped?
Did the alert get modified, disable/enabled after setting up stack monitoring? (if so, I'd be interested in the details from step 1 of the last user who did one of those actions).
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