To replace any header with a new template, follow the documentation of
email_config here
<https://prometheus.io/docs/alerting/latest/configuration/#email_config>.
# Further headers email header key/value pairs. Overrides any headers #
previously set by the notification implementation. [ headers: { <string>
<https://prometheus.io/docs/alerting/latest/configuration/#string>:
<tmpl_string>
<https://prometheus.io/docs/alerting/latest/configuration/#tmpl_string>,
... } ]
The default value comes from here
<https://github.com/prometheus/alertmanager/blob/main/template/default.tmpl#L80>
which
sets:
{{ define "email.default.subject" }}{{ template "__subject" . }}{{ end }}
That is, if you don't override it, then it uses the value of the
"__subject" variable, the definition of which I pointed you to before.
On Friday, 19 November 2021 at 06:58:08 UTC [email protected] wrote:
>
> Hi Brian,
>
> Thanks for you inputs. Could you please help me where to add in and what
> to modify in the below line of code to get the email subject with the
> keyword "DOWN" for firing alerts and "UP" for resolved alerts.
>
> {{ define "__subject" }}[{{ .Status | toUpper }}{{ if eq .Status "firing"
> }}:{{ .Alerts.Firing | len }}{{ end }}] {{ .GroupLabels.SortedPairs.Values
> | join " " }} {{ if gt (len .CommonLabels) (len .GroupLabels) }}({{ with
> .CommonLabels.Remove .GroupLabels.Names }}{{ .Values | join " " }}{{ end
> }}){{ end }}{{ end }}
>
> Best Regards,
> Suman
> On Thursday, November 18, 2021 at 5:24:53 PM UTC+5:30 Brian Candler wrote:
>
>> This is already done for you. With the default templates, the subject
>> line has a prefix like [FIRING:2] or [RESOLVED].
>>
>> However if your alerts are being grouped, and let's say one alert
>> resolves, then you might then get an E-mail with subject [FIRING:1] which
>> shows one alert still firing and one alert resolved. That is: a single
>> E-mail may contain both "DOWN" and "UP" notifications.
>>
>> You can change the templates if you like. There is documentation here
>> <https://prometheus.io/docs/alerting/latest/notifications/>. The
>> default subject line is created here
>> <https://github.com/prometheus/alertmanager/blob/main/template/default.tmpl#L4>
>> and
>> you can override this with your own template string.
>>
>> But to be honest, I've switched off all "resolved" notifications now.
>> There's a good explanation why here:
>>
>> https://www.robustperception.io/running-into-burning-buildings-because-the-fire-alarm-stopped
>>
>> In short: the fact that an alert condition has ceased is not an excuse to
>> your staff to say "oh that's OK, the problem has gone; I can ignore it
>> now". There *was* a problem and it *still* needs to be investigated. You
>> can use an alert to open a ticket, but you should close the ticket manually.
>>
>> This document is also *very* well worth reading:
>>
>> https://docs.google.com/document/d/199PqyG3UsyXlwieHaqbGiWVa8eMWi8zzAn0YfcApr8Q/edit
>>
>> On Thursday, 18 November 2021 at 08:54:08 UTC [email protected] wrote:
>>
>>> Hi Team,
>>>
>>> I want to set the subject line in alertmanager based on send_resolved
>>> status. I mean before resolving the alert subject line should be "DOWN" and
>>> after resolving the alert subject line should be set to "UP".
>>>
>>> Could someone please guide me how to achieve this or provide me syntax
>>> please?
>>>
>>> Best Regards,
>>> Sriman
>>>
>>
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