Add card feature to msteamsv2_config

[jverger]

The goal of this PR is to add an option card to the msteamsv2_config configuration.

If this card option is not used, the default behaviour is keept using title and text values.

Here is an example screenshot of the default result in msteams channel:

When using card option, the user is able to customize the msteams card rendering output by using a custom template file and configuring card option to use this template.

Here is an example screenshot of the output result in msteams channel when using card option:

To be honest, it's the first time i'm developing in go and create a PR.
Hope it will be not so bad :)

[jverger]

All checks have passed 🎉 , waiting for someone to merge this PR ⌚

[grobinson-grafana]

I would really like to avoid pushing users towards templating JSON blobs. It has a lot of problems that I've explained in a couple other PRs such as #3799 (comment).

I think supporting cards would be excellent, because visually its a massive improvement, but just not with templated JSON.

[jverger]

Nevermind, I would have try.
Thank you for your answer.

[grobinson-grafana]

What if you made cards the default instead of a separate field, using the template you have already written? Visually it looks so much better in my opinion!

[jverger]

Hello @grobinson-grafana !

I'm trying to add a card template in the default.tmpl file but it does not work (and i don't know why 😢 )
The error message looks like this:
level=ERROR source=dispatch.go:360 msg="Notify for alerts failed" component=dispatcher num_alerts=1 err="teams/msteamsv2[0]: notify retry canceled due to unrecoverable error after 1 attempts: template: :1:12: executing \"\" at <{{template \"msteamsv2.default.card\" .}}>: template \"msteamsv2.default.card\" not defined"

I think that i've correctly defined the card template but it does not seem to detect it...

Some help is needed

[ewencodes]

Hi @jverger, did you rename your template function to msteamsv2.default.card in default.tmpl ?

Your card is more readable then the existing one, we need your template to be used as default one :)

[deejiw]

@ewencodes @grobinson-grafana I have updated the default card template as per request. Is it what you are expected?