|null */ public ?array $attributeKeys; /** * @readonly */ public ?AggregationInterface $aggregation; /** * @param list|null $attributeKeys */ public function __construct( string $name, ?string $unit, ?string $description, ?array $attributeKeys, ?AggregationInterface $aggregation ) { $this->name = $name; $this->unit = $unit; $this->description = $description; $this->attributeKeys = $attributeKeys; $this->aggregation = $aggregation; } }