[PLAT-8078] Webhook topics update to include threads & reply hooks

[MadisonEhlers-Vertex]

Summary

These changes document the webhook fields for reply.created, reply.updated, reply.deleted, thread.created, thread.updated, and thread.deleted.

Here is a video of the visual changes to add these recently added webhook topics:

2026-03-04_11-59-14.mp4

Test Plan

Release Notes

Possible Regressions

Dependencies

[Copilot]

Pull request overview

This PR adds documentation for six new webhook topics related to the Collaboration APIs: thread.created, thread.updated, thread.deleted, reply.created, reply.updated, and reply.deleted. These new topics let users subscribe to and react to thread/reply lifecycle events in the Vertex Platform.

Changes:

• Documents the thread.created, thread.updated, and thread.deleted webhook events, including their included resources and (for thread.updated) data.attributes.changed properties.
• Documents the reply.created, reply.updated, and reply.deleted webhook events, including their included resources and (for reply.updated) data.attributes.changed properties.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud