public @Nullable UsageCluster findCluster(@Nullable UsageInfo usageInfo) {
    synchronized (myClusters) {
      for (UsageCluster cluster : myClusters) {
        if (cluster.contains(usageInfo)) {
          return cluster;
        }
      }
    }
    return null;
  }
public @Nullable UsageCluster findCluster(@Nullable UsageInfo usageInfo)