code: public static MemcachedManagerBuilder memcachierAddOn() {
          final String memcachierServers = System.getenv("MEMCACHIER_SERVERS");
          return memcachedConfig()
                  .username(System.getenv("MEMCACHIER_USERNAME"))
                  .password(System.getenv("MEMCACHIER_PASSWORD"))
                  .url(memcachierServers == null ? DEFAULT_URL : memcachierServers);
      }
docs: Configuration based on system properties set by the memcachierAddOn