private static void logDisabledMessageOnce() {
    if (!loggedDisableMessage) {
      LOG.info(
        "StoreHotnessProtector is disabled. Set {} > 0 to enable, "
          + "which may help mitigate load under heavy write pressure.",
        PARALLEL_PUT_STORE_THREADS_LIMIT);
      loggedDisableMessage = true;
    }
  }
{@link #init(Configuration)} is called for every Store that opens on a RegionServer. Here we
make a lightweight attempt to log this message once per RegionServer, rather than per-Store.
The goal is just to draw attention to this feature if debugging overload due to heavy writes.
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/throttle/StoreHotnessProtector.java