Allow customizing notifications for Metric Alerts

[JParisFerrer]

Problem Statement

I want to link a playbook to the firing notifications of a metric alert. For issue alerts, I can customize the slack messages for example with a notes field where I can do this.

With metric alerts, none of the notification destinations allow specifying any context here, and the alert doesn't have a free form description either.

This essentially makes it impossible to have a metric alert used to notify teams that are not already intimately familiar with the details of how Sentry is integrated into their organization (eg, a product team vs the infrastructure team owning the Sentry deployment)

Solution Brainstorm

Add more custom fields to the actions for metric alerts, similar to Issue Alerts. For example, for email, add a notes field here. Same for Slack:

Product Area

Alerts

[getsantry[bot]]

Auto-routing to @getsentry/product-owners-alerts for triage ⏲️

[ameliahsu]

Thank you for submitting this feature request! I’ve added this ticket to our team’s backlog so we can schedule this work. Feel free to ping on this ticket again for status updates.