docs: public static Map<String, String> getBlockDeviceMapping() {
          Map<String, String> blockDeviceMapping = new HashMap<String, String>();
  
          List<String> devices = getItems(EC2_METADATA_ROOT + "/block-device-mapping");
          if (devices != null) {
              for (String device : devices) {
                  blockDeviceMapping.put(device, getData(EC2_METADATA_ROOT
                                                         + "/block-device-mapping/" + device));
              }
          }
          return blockDeviceMapping;
      }