docs: private void initInstanceFingerprint() {
  
          Properties properties = System.getProperties();
  
          int port = 0;
  
          // get host
          String host = properties.getProperty("VCAP_APP_HOST");
          if (host == null) {
  
              InetAddress addr;
              try {
                  addr = InetAddress.getLocalHost();
                  host = addr.getHostName();
              } catch (UnknownHostException e) {
                  LOGGER.info("");
              }
  
          } else {
              // get port
              try {
                  port = Integer.parseInt(properties.getProperty("VCAP_APP_HOST"));
              } catch (Exception e) {
                  LOGGER.info("");
              }
          }
  
          instanceFingerprint = new InstanceFingerprint(host, port, UUID.randomUUID().toString());
      }