You could also use something like:
changes(node_boot_time_seconds[1h]) > 0
...to tell you whether there was a reboot in the last hour. Note that all
of these types of alerts in Prometheus will eventually auto-resolve since
they alert based on a steadily moving window.
On Thu, Apr 28, 2022 at 7:31 AM Brian Candler <[email protected]> wrote:
> I don't know what you mean by "wrong alerts", but I use the following:
>
> - alert: rebootNode
> expr: node_boot_time_seconds > (node_boot_time_seconds offset 5m +
> 5)
> labels:
> severity: warning
> annotations:
> summary: 'Device rebooted at {{ $value | humanizeTimestamp }}'
>
> On Wednesday, 27 April 2022 at 15:43:20 UTC+2 [email protected] wrote:
>
>> Hello,
>>
>> I would like to monitor reboot of the server, when server reboots need to
>> send alert via alertmanager.
>>
>> Currently I am using following expression
>> expr: rate(node_boot_time{job="kubernetes-service-endpoints"} [1h])*
>> on(instance) group_left(nodename)
>> group(node_uname_info{})by(instance,nodename)>0 or
>>
>> rate(node_boot_time{job="kubernetes-service-endpoints"} [1h])>0
>>
>> But I can see wrong alerts are keep populating in my mail box.
>>
>> Could you please provide me expression we can use other than what I had
>> used.
>>
>> Thanks
>> DV
>>
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Julius Volz
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