Alerts "resolve" when they no longer exist. Consider for example:
expr: foo < 3
The result of this promQL expression is all metrics with __name__="foo" and
value < 3. So given as input:
foo{instance="bar"} 1
foo{instance="baz"} 2
foo{instance="qux"} 4
then expr: foo < 3 gives
foo{instance="bar"} 1
foo{instance="baz"} 2
Hence the alert triggers with two values. If any of them go back to 3 or
higher, then they vanish from the expression results.
An alert "resolving" is simply when it ceases to exist.
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