开源版(5.8.6)出现high_system_memory_usage告警，导致mqtt连接不上，怎么解决？下面是部分日志

EMQX
1

2025-10-27T09:58:45.014040+08:00 [warning] msg: emqx_connector_on_start_already_started, connector: <<“connector:http:offlineGateWay_WH_D”>>, pool_name: <<“connector:http:offlineGateWay_WH_D”>>
2025-10-27T09:58:45.016883+08:00 [warning] tag: CONNECTOR/WEBHOOK, msg: start_resource_failed, reason: econnrefused, resource_id: <<“connector:http:offlineGateWay_WH_D”>>
2025-10-27T09:58:45.109943+08:00 [warning] msg: emqx_connector_on_start_already_started, connector: <<“connector:http:saveGateWay_WH_D”>>, pool_name: <<“connector:http:saveGateWay_WH_D”>>
2025-10-27T09:58:45.112360+08:00 [warning] tag: CONNECTOR/WEBHOOK, msg: start_resource_failed, reason: econnrefused, resource_id: <<“connector:http:saveGateWay_WH_D”>>
2025-10-27T09:58:45.153121+08:00 [warning] msg: emqx_connector_on_start_already_started, connector: <<“connector:http:saveSetReplyValue_WH_D”>>, pool_name: <<“connector:http:saveSetReplyValue_WH_D”>>
2025-10-27T09:58:45.155679+08:00 [warning] tag: CONNECTOR/WEBHOOK, msg: start_resource_failed, reason: econnrefused, resource_id: <<“connector:http:saveSetReplyValue_WH_D”>>
2025-10-27T09:58:45.221157+08:00 [warning] msg: emqx_connector_on_start_already_started, connector: <<“connector:http:saveEquWarn_WH_D”>>, pool_name: <<“connector:http:saveEquWarn_WH_D”>>
2025-10-27T09:58:45.223963+08:00 [warning] tag: CONNECTOR/WEBHOOK, msg: start_resource_failed, reason: econnrefused, resource_id: <<“connector:http:saveEquWarn_WH_D”>>
2025-10-27T09:58:45.256943+08:00 [warning] msg: emqx_connector_on_start_already_started, connector: <<“connector:http:saveTopic_WH_D”>>, pool_name: <<“connector:http:saveTopic_WH_D”>>
2025-10-27T09:58:45.259802+08:00 [warning] tag: CONNECTOR/WEBHOOK, msg: start_resource_failed, reason: econnrefused, resource_id: <<“connector:http:saveTopic_WH_D”>>
2025-10-27T09:58:45.269961+08:00 [warning] msg: emqx_connector_on_start_already_started, connector: <<“connector:http:updateEqu_WH_D”>>, pool_name: <<“connector:http:updateEqu_WH_D”>>
2025-10-27T09:58:45.272204+08:00 [warning] tag: CONNECTOR/WEBHOOK, msg: start_resource_failed, reason: econnrefused, resource_id: <<“connector:http:updateEqu_WH_D”>>
2025-10-27T09:58:45.317142+08:00 [warning] msg: emqx_connector_on_start_already_started, connector: <<“connector:http:saveEqu_WH_D”>>, pool_name: <<“connector:http:saveEqu_WH_D”>>
2025-10-27T09:58:45.319735+08:00 [warning] tag: CONNECTOR/WEBHOOK, msg: start_resource_failed, reason: econnrefused, resource_id: <<“connector:http:saveEqu_WH_D”>>
2025-10-27T09:59:00.021926+08:00 [warning] msg: alarm_is_deactivated, name: <<“connector:http:offlineGateWay_WH_D”>>
2025-10-27T09:59:00.022655+08:00 [warning] msg: alarm_is_deactivated, name: <<“action:http:offlineGateWay_WH_D:connector:http:offlineGateWay_WH_D”>>
2025-10-27T09:59:00.117493+08:00 [warning] msg: alarm_is_deactivated, name: <<“connector:http:saveGateWay_WH_D”>>
2025-10-27T09:59:00.117919+08:00 [warning] msg: alarm_is_deactivated, name: <<“action:http:saveGateWay_WH_D:connector:http:saveGateWay_WH_D”>>
2025-10-27T09:59:00.160447+08:00 [warning] msg: alarm_is_deactivated, name: <<“connector:http:saveSetReplyValue_WH_D”>>
2025-10-27T09:59:00.160860+08:00 [warning] msg: alarm_is_deactivated, name: <<“action:http:saveSetReplyValue_WH_D:connector:http:saveSetReplyValue_WH_D”>>
2025-10-27T09:59:00.235593+08:00 [warning] msg: alarm_is_deactivated, name: <<“connector:http:saveEquWarn_WH_D”>>
2025-10-27T09:59:00.236030+08:00 [warning] msg: alarm_is_deactivated, name: <<“action:http:saveEquWarn_WH_D:connector:http:saveEquWarn_WH_D”>>
2025-10-27T09:59:00.265070+08:00 [warning] msg: alarm_is_deactivated, name: <<“connector:http:saveTopic_WH_D”>>
2025-10-27T09:59:00.265430+08:00 [warning] msg: alarm_is_deactivated, name: <<“action:http:saveTopic_WH_D:connector:http:saveTopic_WH_D”>>
2025-10-27T09:59:00.278110+08:00 [warning] msg: alarm_is_deactivated, name: <<“connector:http:updateEqu_WH_D”>>
2025-10-27T09:59:00.278598+08:00 [warning] msg: alarm_is_deactivated, name: <<“action:http:updateEqu_WH_D:connector:http:updateEqu_WH_D”>>
2025-10-27T09:59:00.324726+08:00 [warning] msg: alarm_is_deactivated, name: <<“connector:http:saveEqu_WH_D”>>
2025-10-27T09:59:00.325052+08:00 [warning] msg: alarm_is_deactivated, name: <<“action:http:saveEqu_WH_D:connector:http:saveEqu_WH_D”>>
2025-10-27T10:28:56.118477+08:00 [warning] tag: AUTHN, clientid: test, msg: authentication_failure, peername: 211.210.31.145:62872, reason: bad_username_or_password
2025-10-27T12:24:51.984648+08:00 [warning] tag: AUTHN, clientid: nmap, msg: authentication_failure, peername: 187.236.176.121:55545, reason: bad_username_or_password
2025-10-27T12:49:30.489736+08:00 [warning] msg: alarm_is_activated, message: <<“77.72% mem usage”>>, name: high_system_memory_usage
2025-10-27T13:03:56.573079+08:00 [warning] msg: alarm_is_activated, message: <<“77.73% mem usage”>>, name: high_system_memory_usage
2025-10-27T13:54:42.038414+08:00 [warning] msg: alarm_is_activated, message: <<“resource down: #{error => closed,status => disconnected}”>>, name: <<“action:http:saveSetReplyValue_WH_D:connector:http:saveSetReplyValue_WH_D”>>
2025-10-27T13:54:57.042465+08:00 [warning] msg: alarm_is_deactivated, name: <<“action:http:saveSetReplyValue_WH_D:connector:http:saveSetReplyValue_WH_D”>>
2025-10-27T14:26:50.365260+08:00 [warning] msg: alarm_is_activated, message: <<“77.82% mem usage”>>, name: high_system_memory_usage
2025-10-27T15:54:45.809746+08:00 [warning] tag: AUTHN, clientid: CENSYS, msg: authentication_failure, peername: 216.168.34.122:43832, reason: bad_username_or_password
2025-10-27T17:39:00.601363+08:00 [warning] tag: AUTHN, clientid: MqttClient, msg: authentication_failure, peername: 165.49.1.192:4956, reason: bad_username_or_password
2025-10-27T18:02:57.318117+08:00 [warning] tag: AUTHN, clientid: ONYPHE, msg: authentication_failure, peername: 191.231.89.119:36099, reason: bad_username_or_password
2025-10-27T19:58:09.903729+08:00 [warning] tag: AUTHN, clientid: ONYPHE, msg: authentication_failure, peername: 125.184.76.136:55695, reason: bad_username_or_password
2025-10-27T23:04:09.311441+08:00 [warning] msg: alarm_is_activated, message: <<“resource down: #{error => closed,status => disconnected}”>>, name: <<“action:http:saveEquWarn_WH_D:connector:http:saveEquWarn_WH_D”>>
2025-10-27T23:04:24.312373+08:00 [warning] msg: alarm_is_deactivated, name: <<“action:http:saveEquWarn_WH_D:connector:http:saveEquWarn_WH_D”>>

2

日志里面我没有看到 high_system_memory_useage 导致了mqtt connect 不上：
只看到了。
1.

这个 webhook 无法连接。

认证直接失败了：提示是错误的用户名和密码（这个应该才是你 MQTT 连接不上来的直接原因。）

3

同一设备连接的，第一次可以连接上。然后断电重新连接的时候，就连接不上了。密码也没有修改过。很奇怪的是，过了20多分钟之后，又全部自动连上了。不知道为什么？

4

思路：对比这个设备连不上，和成功连接的 debug 或 trace 日志。看看有区别。

5

emqx.log里打印的日志不太详细，可以在那里配置一下吗？

6

在官方文档里面有。