It's nothing to do with alertmanager, because alertmanager does not support
any sort of templating for webhooks. You haven't shown your alertmanager
config, but I presume it's something like this:
receivers:
- name: 'prometheus-msteams'
webhook_configs:
- send_resolved: true
url: 'http://localhost:2000/testChannel
So, alertmanager sends a fixed-format JSON message to this destination. If
you have a problem with the data after this point, it must be down to the
prometheus-msteams and its use of that template you showed.
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