public static Integer getHttp2PortStr(InstanceConfig instanceConfig) {
    return getHttp2PortStr(instanceConfig.getRecord());
  }
Get the http2 port associated with the given instance (if any).
@param instanceConfig the {@link InstanceConfig} associated with the interested instance.
@return the http2 port associated with the given instance.
ambry-clustermap/src/main/java/com/github/ambry/clustermap/ClusterMapUtils.java