Hi all, I tried it now for two days straight and I just don't get it 
working.

First of all where do I actually find the expressions I can use to define 
the subject under the header? I am still missing a template I can use? I 
don't really have one in my Prom/Alert-files.
Second of all my current receivers are configured like so:

receivers:
- name: 'email'
  email_configs:
  - to: '[email protected]'
    send_resolved: true
    headers:
      Subject: "{{ .Alerts.alertname }} - {{ range .Alerts }} {{ 
.Alerts.instance }} {{ end }}"

Like Brian said, I want to iterate in the second half of that "statement" 
(I don't actually know how these {{ .xyz }} are called) through all 
instances and the first one should just say which alert is now firing.
I also tried it as followed:

Subject: "{{ .GroupLabels.alertname }} - {{ range .Alerts }} {{ 
.Alerts.instance }} {{ end }}"
and
Subject: "{{ .Labels.alertname }} - {{ range .Alerts }} {{ .Alerts.instance 
}} {{ end }}"

but nothing is really working.

All I really want is the Subject like so e.x.:
InstanceDown - SVR-DS01 SVR-DC11
       ^^^^^^^^            ^^^^^^^^    ^^^^^^^^          
    Alertname    -   Instance1 Instance2 (if it is also possible to 
seperate the instances via comma would be perfect)
Brian Candler schrieb am Dienstag, 6. Juni 2023 um 13:16:53 UTC+2:

> As its name implies, "CommonLabels" contains only those labels which are 
> common to all alerts in the group.  If there are multiple instances, then 
> the "instance" label is not common to all alerts, so won't be in this 
> object.
>
> You want to iterate over "Alerts" (or "Alerts.Firing") and look at the 
> Labels.instance within each alert. You will find an example showing how to 
> do that here:
>
> https://prometheus.io/docs/alerting/latest/notification_examples/#ranging-over-all-received-alerts
>
> Additional references:
> https://prometheus.io/docs/alerting/latest/notifications/#data
>
> https://prometheus.io/docs/prometheus/latest/configuration/template_reference/
>
> On Tuesday, 6 June 2023 at 12:03:03 UTC+1 Kolja Krückmann wrote:
>
>> Currently my alertmanager.yml looks like this:
>>
>> receivers:
>> - name: 'email'
>>   email_configs:
>>   - to: '[email protected]'
>>     send_resolved: true
>>     headers:
>>       Subject: '{{ .CommonLabels.alertname }} - {{ .CommonLabels.instance 
>> }}'
>>
>> Unfortunately the subject in the mail now only displays both labels if 
>> only there is an alert for a single instance (like High CPU Usage on core 
>> 0,1,2,3 on one instance (see screenshot attatched)) As soon as the alert is 
>> for more then just one instance the instance lable is completly missing... 
>> Why is it missing? And how can I change it to display all instances 
>> affected by that alert.
>>
>> Kind regards.
>> Kolja
>>
>> [image: mail.png]
>>
>> Kolja Krückmann schrieb am Montag, 5. Juni 2023 um 09:21:22 UTC+2:
>>
>> Hi y'all
>> I'm trying to change the way the mail from my alertmanger looks and 
>> behaves.
>> My goal is to have the subject list the alertname and the targets 
>> detected by that alert. (I need it like that for future todo's)
>> My first problem is, i dont have any templates in my files. Do I need to 
>> clone one from git? How does the prom know, I have a template? 
>> The second one would be to change the subject in order for my 
>> requirements to fit.
>>
>> Kind regards,
>> Kolja
>>
>>

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