public void clearStaleAlert(Long hostId, Long definitionId) {
    if (staleAlerts.containsKey(hostId)) {
      staleAlerts.get(hostId).remove(definitionId);
    }
  }
Removes specified stale alert from specified host.
@param hostId host id.
@param definitionId alert definition id.
ambari-server/src/main/java/org/apache/ambari/server/state/alert/AlertHelper.java