Update MergeRequest webhook to provide more clarity

Sincheol (David) Kimrequested to merge
470063-document-current-state-of-merge-request-webhooks into master

What does this MR do and why?

Update MergeRequest webhook to provide more clarity

It adds:

  • Describe overall payload structure
  • A list of available attributes for object_attributes
  • A list of available attributes for changes attributes
  • Deprecation notes

References

#470063 (closed)

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Before After

How to set up and validate locally

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Evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Related to #470063 (closed)

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