Filter alertmanager notification like slack using templates

[Rahul Hada]

Hi All, 

We are using templates to refine the parameters going to the slack channel from alertmanager, we do have one api to which we are sending alert notifications but while using same templates for api, reloading the alertmanager.yml gives error " field title not found in type config.plain". I have rechecked if there is any indentation error in yaml file. Please suggest whether it is possible for api or not. If yes , please guide me towards it.

Template file :- 

{{ define "webhook.default.title" }}{{ template "__subject" . }}{{ end }}

{{ define "webhook.default.username" }}{{ template "__alertmanager" . }}{{ end }}

{{ define "webhook.default.fallback" }}{{ template "webhook.default.title" . }} | {{ template "webhook.default.titlelink" . }}{{ end }}

{{ define "webhook.default.pretext" }}{{ end }}

{{ define "webhook.default.titlelink" }}{{ template "__alertmanagerURL" . }}{{ end }}

{{ define "webhook.default.iconemoji" }}{{ end }}

{{ define "webhook.default.iconurl" }}{{ end }}

{{ define "webhook.default.text" }}{{ end }}

{{ define "webhook.default.footer" }}{{ end }}

Alertmanager.yml file :- 

- name: "en_api"

  webhook_configs:

  - url: http://dticket.xxxxxxx.com/prometheus_api.php

    title: '{{ template "webhook.default.title" . }}'

    text: |-

      {{ range .Alerts }}

         *ALERT:* {{ .Annotations.summary }} - `{{ .Labels.severity }}`

        *DESCRIPTION:* {{ .Annotations.description }}

        {{ .Annotations.identifier }}

      {{ end }}

Thanks in Advance

[Murali Krishna Kanagala]

To send an alert to a web hook there is no need for a template. The receiver api receivs the alerts in as json payload. 

https://prometheus.io/docs/alerting/configuration/#webhook_config

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[Rahul Hada]

I am able to get json data, but was looking for more appropriate template so that could send only required parameters to the api. Any suggestions for that would be appreciated.

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[Murali Krishna Kanagala]

I dont think the webhook receiver config supports templates. If your api receiver does not accept the json payload sent by alertmanager then you may need to write a custom translator something like a small flask app that can receive the data from alertmanager, process it and push it to your api.