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UpdateGuardrailRule

PATCH 
/v1/customers/:customer_id/projects/:project_id/guardrails/:guardrail_id/rules/{rule.id}

UpdateGuardrailRule updates mutable rule fields. Omitted/empty scalar string fields leave the existing value untouched. Enum fields set to *_UNSPECIFIED leave the existing value untouched. Absent message fields (triggered_response, configuration) leave the existing value untouched; a present configuration Struct REPLACES the stored configuration wholesale (no deep merge). The rule id must be set inside the rule field. Returns PERMISSION_DENIED when the target rule's parent guardrail is a template (is_template=true); templates are instantiated via CreateGuardrailFromTemplate, never mutated.

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