code: public function getContainerMetadata($containerName = '')
      {
          Assertion::notEmpty($containerName, 'Container name is not specified');
          self::assertValidContainerName($containerName);
  
          return $this->getContainer($containerName)->Metadata;
      }
docs: Get container metadata
  
  @param string $containerName  Container name
  @return array Key/value pairs of meta data
  @throws BlobException