void connectionCrashed(Connection con) {
    // the endpoint has not crashed but this method does all the work
    // we need to do
    endpointCrashed(con.getEndpoint());
  }
Manages Client Queues. Responsible for creating callback connections and satisfying redundancy
requirements.

@since GemFire 5.7
geode-core/src/main/java/org/apache/geode/cache/client/internal/QueueManagerImpl.java