Alert: no_data status

Hi,
I would like to create alert on cpu usages (obtained by telegraf + influxdb) but I always get no data status when I test rule. What is wrong?

I always get something similar for test rule:

{
“firing”: false,
“state”: “no_data”,
“conditionEvals”: “false = false”,
“timeMs”: “1.774ms”,
“logs”: [
{
“message”: “Condition[0]: Query”,
“data”: {
“from”: 1583675165767,
“queries”: [
{
“refId”: “A”,
“model”: {
“alias”: “$tag_host: $col”,
“dsType”: “influxdb”,
“function”: “mean”,
“groupBy”: [
{
“interval”: “auto”,
“params”: [
“auto”
],
“type”: “time”
},
{
“key”: “host”,
“params”: [
“tag”
],
“type”: “tag”
}
],
“hide”: false,
“interval”: “1s”,
“measurement”: “cpu_percentageBusy”,
“orderByTime”: “ASC”,
“policy”: “default”,
“query”: “SELECT mean(usage_user) as “user”, mean(usage_system) as “system”, mean(usage_softirq) as “softirq”, mean(usage_steal) as “steal”, mean(usage_nice) as “nice”, mean(usage_irq) as “irq”, mean(usage_iowait) as “iowait”, mean(usage_guest) as “guest”, mean(usage_guest_nice) as “guest_nice” FROM “cpu” WHERE “host” =~ /server/ and cpu = ‘cpu-total’ AND $timeFilter GROUP BY time($interval), *”,
“rawQuery”: true,
“refId”: “B”,
“resultFormat”: “time_series”,
“select”: [
[
{
“params”: [
“value”
],
“type”: “field”
},
{
“params”: [],
“type”: “mean”
}
]
],
“tags”: []
},
“datasource”: {
“id”: 1,
“name”: “InfluxDB”
},
“maxDataPoints”: 0,
“intervalMs”: 0
}
],
“to”: 1583678765767
}
},
{
“message”: “Condition[0]: Query Result”,
“data”: {
“series”: []
}
},
{
“message”: “Condition: Eval: false, Query Returned No Series (reduced to null/no value)”,
“data”: null
}
]
}

I’m using Grafana v6.6.2 (3fa63cfc34)

thank you

fairly old question by now, but in the documentation (https://grafana.com/docs/grafana/latest/alerting/create-alerts/#rule) it says:

Caution: Do not use For with the If no data or all values are null setting set to No Data . The triggering of No Data will trigger instantly and not take For into consideration. This may also result in that an OK notification not being sent if alert transitions from No Data -> Pending -> OK .