public ConcurrentHashMap<String, TimeoutInfo> getProducerRegMap() {
        return producerRegMap;
    }
Get the map of producers which consists of the key of nodes and the timeout info of nodes

@return the map of timeout info of producers' nodes
inlong-tubemq/tubemq-server/src/main/java/org/apache/inlong/tubemq/server/common/heartbeat/HeartbeatManager.java