It seems like $this->labeled($metric, $labels)->get('labels') can also be of type null; however, parameter $labels of Krenor\Prometheus\Sample::__construct() does only seem to accept Tightenco\Collect\Support\Collection, maybe add an additional type check?
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Ignorable by Annotation
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If this is a false-positive, you can also ignore this issue in your code via the ignore-type annotation