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Deployments: Add a guide for triggering dependent (downstream) stack updates #19556

Description

@jkodroff

Problem description

The documentation does not describe the canonical, supported way to trigger downstream stack updates when an upstream stack changes. Lacking this, users build webhook workarounds that misbehave — in one reported case the workaround fired ~50x and re-triggered repeatedly. Deployment Triggers and StackReference exist, but neither documents the recommended pattern for cascading a deploy to dependent stacks without duplicate fires or loops.

Suggestions for a fix

Write a guide showing the recommended pattern for triggering dependent stack updates, with explicit guidance on avoiding duplicate fires and re-trigger loops. Contrast it with the naive webhook approach so users know what to avoid.


Reported from customer feedback on a Clari call (internal). Source: Slack thread.

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