thanks, it's ok now!
在2021年1月28日星期四 UTC+8 下午4:36:39<matt...@prometheus.io> 写道：
> Your expression aggregates away all labels, including instance. As
> written, this alert would only fire if exactly one instance is down, not if
> two are down. Try removing the count altogether:
>
> up{group="tty",job="test101"} == 0
>
> will tell you per-instance when they cannot be scraped.The Alertmanager
> can group all of these together so you get one notification.
>
> /MR
>
> On Thu, Jan 28, 2021 at 8:12 AM guo galen <galen....@gmail.com> wrote:
>
>> use:
>> prometheus-2.24.1.linux-amd64.tar.gz
>> alertmanager-0.21.0.linux-amd64.tar.gz
>>
>> 在2021年1月28日星期四 UTC+8 下午3:49:28<guo galen> 写道：
>>
>>> 1. rule.yml:
>>> groups:
>>> - name: test_alert
>>> rules:
>>>
>>> - alert: xxx-shutdown
>>> expr: count(up{group="tty",job="test101"} == 0 ) == 1
>>> for: 30s
>>> labels:
>>> severity: emergency
>>> reporter: prometheus
>>> annotations:
>>> summary: "{{ $labels.instance }} shutdown"
>>> description: "{{ $labels.group }} of job {{ $labels.job}} shutdown"
>>>
>>> 2. get alert message like below:
>>>
>>> [FIRING:1]
>>> Alerts Firing
>>>
>>> [EMERGENCY] shutdown
>>> Description: of job shutdown
>>>
>>> Graph: 📈
>>>
>>> Details:
>>>
>>> alertname: xxx-shutdown
>>> reporter: prometheus
>>>
>>>
>>> --
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>
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