tsdb.HandleRequest() error rpc error: code = Unavailable desc = transport is closing

Hello I am faced with error:
error:“tsdb.HandleRequest() error rpc error: code = Unavailable desc = transport is closing”

I try to use alerts of bandwidth usage with Grafana and Zabbix datasoucre.
Grafana version is v7.4.0 (c2203b9859)
Zabbix Plugin is 4.1.4
I run them under Raspberry Pi3.
My Grafana renderer is
[adejong/grafana-image-renderer-pi:1.0.8-beta2]
And it’s available at 10.10.20.20:32773 in CoreElec 9 under Docker.
My zabbix and grafana are available under Raspberry Pi3 with the same IP address 10.10.10.4, zabbix uses port 80, grafana uses 8080.
I will share the results of test rule.

Any idea?

{
“firing”: true,
“state”: “pending”,
“conditionEvals”: " = true",
“timeMs”: “296.172ms”,
“error”: “tsdb.HandleRequest() error rpc error: code = Unavailable desc = transport is closing”,
“logs”: [
{
“message”: “Condition[0]: Query”,
“data”: {
“from”: 1615722174175,
“queries”: [
{
“refId”: “A”,
“model”: {
“application”: {
“filter”: “Interface ether1(WAN Vivacom)”
},
“functions”: [],
“group”: {
“filter”: “Network Devices”
},
“host”: {
“filter”: “SH-RT-MT-AC2”
},
“item”: {
“filter”: “Interface ether1(WAN Vivacom): Bits received”
},
“options”: {
“disableDataAlignment”: false,
“showDisabledItems”: false,
“skipEmptyValues”: false
},
“proxy”: {
“filter”: “”
},
“queryType”: 0,
“refId”: “A”,
“resultFormat”: “time_series”,
“table”: {
“skipEmptyValues”: false
},
“tags”: {
“filter”: “”
},
“trigger”: {
“filter”: “”
},
“triggers”: {
“acknowledged”: 2,
“count”: true,
“minSeverity”: 3
}
},
“datasource”: {
“id”: 8,
“name”: “Zabbix”
},
“maxDataPoints”: 0,
“intervalMs”: 0
}
],
“to”: 1615722474175
}
}
]
}

Execution Error: tsdb.HandleRequest() error rpc error: code = Unavailable desc = connection error: desc = “transport: error while dialing: dial unix /tmp/plugin570669214: connect: connection refused”

The logs are:
root@raspberrypi:/# tail -f /var/log/grafana/grafana.log
t=2021-03-14T14:57:02+0200 lvl=info msg=“Path Home” logger=settings path=/usr/share/grafana
t=2021-03-14T14:57:02+0200 lvl=info msg=“Path Data” logger=settings path=/var/lib/grafana
t=2021-03-14T14:57:02+0200 lvl=info msg=“Path Logs” logger=settings path=/var/log/grafana
t=2021-03-14T14:57:02+0200 lvl=info msg=“Path Plugins” logger=settings path=/var/lib/grafana/plugins
t=2021-03-14T14:57:02+0200 lvl=info msg=“Path Provisioning” logger=settings path=/etc/grafana/provisioning
t=2021-03-14T14:57:02+0200 lvl=info msg=“App mode production” logger=settings
t=2021-03-14T14:57:02+0200 lvl=info msg=“Writing PID file” logger=server path=/var/run/grafana/grafana-server.pid pid=6636
t=2021-03-14T14:57:02+0200 lvl=info msg=“Connecting to DB” logger=sqlstore dbtype=sqlite3
t=2021-03-14T14:57:02+0200 lvl=info msg=“Starting DB migrations” logger=migrator
t=2021-03-14T14:57:02+0200 lvl=info msg=“Starting plugin search” logger=plugins
t=2021-03-14T14:57:05+0200 lvl=info msg=“Registering plugin” logger=plugins id=input
t=2021-03-14T14:57:13+0200 lvl=info msg=“Registering plugin” logger=plugins id=alexanderzobnin-zabbix-datasource
t=2021-03-14T14:57:13+0200 lvl=info msg=“Registering plugin” logger=plugins id=alexanderzobnin-zabbix-triggers-panel
t=2021-03-14T14:57:13+0200 lvl=info msg=“Registering plugin” logger=plugins id=alexanderzobnin-zabbix-app
t=2021-03-14T14:57:13+0200 lvl=info msg=“Backend rendering via external http server” logger=rendering renderer=http
t=2021-03-14T14:57:13+0200 lvl=info msg=“HTTP Server Listen” logger=http.server address=10.10.10.4:8080 protocol=http subUrl= socket=
t=2021-03-14T14:57:13+0200 lvl=info msg=Profiler logger=plugins.backend pluginId=alexanderzobnin-zabbix-datasource enabled=false
t=2021-03-14T14:57:38+0200 lvl=warn msg=“Failed to close stream” logger=plugins.backend err=“cannot close a closed stream”
t=2021-03-14T14:57:38+0200 lvl=warn msg=“Failed to close stream” logger=plugins.backend err=“cannot close a closed stream”
t=2021-03-14T14:57:50+0200 lvl=eror msg=“Alert Rule Result Error” logger=alerting.evalContext ruleId=0 name=“Panel Title alert” error=“tsdb.HandleRequest() error rpc error: code = Unavailable desc = transport is closing” changing state to=alerting
t=2021-03-14T14:57:51+0200 lvl=info msg=Profiler logger=plugins.backend pluginId=alexanderzobnin-zabbix-datasource enabled=false
t=2021-03-14T14:58:02+0200 lvl=eror msg=“Alert Rule Result Error” logger=alerting.evalContext ruleId=8 name=“Panel Title alert” error=“tsdb.HandleRequest() error rpc error: code = Unavailable desc = connection error: desc = “transport: error while dialing: dial unix /tmp/plugin344105054: connect: connection refused”” changing state to=alerting
t=2021-03-14T14:58:02+0200 lvl=info msg=Profiler logger=plugins.backend pluginId=alexanderzobnin-zabbix-datasource enabled=false

Same here! I am trying to use bigquery-grafana alert.
Grafana: version 7.4.2
Platform: debain 10

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