Handling the email template was a headache for me as well. Mostly
because it needs to be written in the Go templating language - which I
was unfamiliar with.
But - there is a way to "dump" all the attributes of the alert to
figure out what the structure is and how you can write the template. I
do this inside a hidden DIV inside the email, so I can view it if
necessary by looking at the source of the email:
```
<div name="GLOBAL DEBUG" style="display: none;">
<!-- Print the data structure we've been handed for
debugging -->
<br>
{{ printf "%#v" . }}
<br>
</div>
```
I generally don't use aggregation for email alerts, because I prefer
to see one email per alert.
I've linked my alertmanager/config/template-email-slack.tmpl , for
reference: https://pastebin.com/ufjyZJhm
I'd also like to learn how to best tune the email template.
On Mon, Oct 23, 2023 at 1:35 PM Jseb Tarot <[email protected]> wrote:
>
> Hello,
>
> I'm trying to change the Alertmanager email template.
>
> I can't seem to adapt an email template to make it work the way my boss
> wants. Personally, I find the default template to be quite good. However, my
> boss finds it a bit messy, which is not entirely untrue. In case of an issue,
> a misinterpretation can be dangerous, especially in a production environment!
> Anyway, I know that the template is in the binary of the prom/alertmanager
> container. However, it is possible to redefine the template to replace the
> default one. I've tested this method:
>
> https://velenux.wordpress.com/2021/04/23/how-to-change-prometheus-alertmanager-e-mail-template/
>
> And it works! But I must admit that, despite my efforts, I can't seem to
> modify this template because even the slightest error results in an empty
> email, but that's normal ;). I know that the developers have defined a large
> number of functions
> (https://prometheus.io/docs/alerting/latest/notifications/). So, in theory,
> we should be able to customize the templates. However, I don't know the list
> of variables I can use, nor the structure that the email template should have.
>
> Can someone help me?
>
> Thank you,
>
> Best regards,
>
>
> JsT
>
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