void onPartitionReadOnly() {
    // no-op. The static manager does not deal with this. In the dynamic world, the cluster manager will rely
    // entirely on Helix for this.
  }
Take actions, if any, on being notified that this partition has become {@link PartitionState#READ_ONLY}
ambry-clustermap/src/main/java/com/github/ambry/clustermap/AmbryPartition.java