private static String createAliasPrefix(String clusterName) {
    return ("cluster." + clusterName + ".").toLowerCase();
  }
Creates the prefix that is to be set in a canonicalized alias name.

@param clusterName the name of the cluster
@return the prefix value
ambari-server/src/main/java/org/apache/ambari/server/security/encryption/CredentialStoreServiceImpl.java