src/ServiceDefinition.php
public function addMetaData(string $key, array $values)
    {
        if (!isset($this->metaData[$key])) {
            $this->metaData[$key] = [];
        }

        $this->metaData[$key][] = $values; return $this;
    }
public function addMetaData(string $key, array $values)
    {
        if (!isset($this->metaData[$key])) {
            $this->metaData[$key] = [];
        }

        $this->metaData[$key][] = $values; return $this;
    }
Sets meta data for the given key

@param string        $key
@param array         $values
@return self