Full control on slack template message

[sk4mi]

Is your feature request related to a problem? Currently, we have limited control over how messages appear in Slack notifications. The default template is too rigid and doesn't allow us to customize the format, layout, and included information according to our specific needs. For example, we can't modify the first two lines before buttons.

Describe the solution you'd like We would like to have full customization capabilities for Slack message templates like alertmanager does

Describe alternatives you've considered Creating a separate sink that handles message formatting

Additional context This feature would greatly improve the readability and usefulness of our Slack notifications, allowing teams to create message templates that match their specific communication needs and workflows. It would also help reduce notification noise by ensuring only relevant information is displayed in an easily digestible format.

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