Question

What is milestone webhook trigger event?

Answer 1

milestone

Webhook event payload	Activity types	GITHUB_SHA	GITHUB_REF
milestone	- created - closed - opened - edited - deleted	Last commit on default branch	Default branch

Note: More than one activity type triggers this event. For information about each activity type

Runs your workflow when a milestone in the workflow's repository is created or modified. For more information about milestones. If you want to run your workflow when an issue is added to or removed from a milestone, use the milestoned or demilestoned activity types for the issues event instead.

For example, you can run a workflow when a milestone has been opened or deleted.

on:
  milestone:
    types: [opened, deleted]