src/Metable.php
public function setMeta($key, $value, $group = null)
    {
        $this->getMetaAttributes()->set($key, $value, $group);
    }
public function setMeta($key, $value, $group = null)
    {
        $this->getMetaAttributes()->set($key, $value, $group);
    }
Set meta attribute.

@param  string $key
@param  mixed  $value
@return void