====== FR-DEP-006 — Deployment Rollback ======

[[dido:02-crusible:99-annexes:annex-c-requirements:03-functional-requirements:03-03-deployment-orchestration:start|Go to Crucible Deployment Orchestration Requirements]]

===== Statement =====

[[dido:99_annexes:annex-b-terms-and-definitions:c:crucible|Crucible]] SHALL perform [[dido:99_annexes:annex-b-terms-and-definitions:d:deployment_rollback|Deployment Rollback]].

===== Derived From =====

This requirement derives from:

  * Crucible System Requirements Specification, Version 1.1 Draft, Functional Requirements, FR-DEP-006

The Original Requirement states:

> //The system shall support [[dido:99_annexes:annex-b-terms-and-definitions:d:deployment_rollback|Deployment Rollback]].//[[dido:02-crusible:99-annexes:annex-b:cr-001|[C1]]]

FR-DEP-006:

  * Replaces **The system** with the defined system name [[dido:99_annexes:annex-b-terms-and-definitions:c:crucible|Crucible]]
  * Changes **shall** to the established uppercase normative form **SHALL**
  * Replaces the weak verb **support** with the observable behavior **perform**
  * Links **Deployment Rollback** to the controlling definition

No other substantive normalization is required.

===== Rationale =====

[[dido:99_annexes:annex-b-terms-and-definitions:d:deployment_rollback|Deployment Rollback]] provides a controlled response when a deployment must be reversed.

This requirement establishes the ability to perform Deployment Rollback without prescribing:

  * The event that initiates the rollback
  * Automatic rollback behavior
  * The deployment subject
  * The state restored by the rollback
  * The rollback mechanism
  * Recovery behavior
  * Backup or restoration behavior
  * Rollback validation
  * Preservation of rollback records

Separate requirements, workflows, or policies define those subjects and behaviors.

===== Applies To =====

This requirement applies to:

  * [[dido:99_annexes:annex-b-terms-and-definitions:c:crucible|Crucible]]
  * [[dido:99_annexes:annex-b-terms-and-definitions:d:deployment_rollback|Deployment Rollback]]
  * Deployments

===== Verification =====

Verification confirms that:

  - A tested Deployment is selected for rollback
  - [[dido:99_annexes:annex-b-terms-and-definitions:c:crucible|Crucible]] performs [[dido:99_annexes:annex-b-terms-and-definitions:d:deployment_rollback|Deployment Rollback]] for the tested Deployment
  - The result of the tested Deployment Rollback can be determined

===== Referenced By =====

The following pages reference this requirement:

{{backlinks>.#dido:02-crusible}}

===== Implementation Status =====

Implemented and Verified

===== Requirement Status =====

<todo>Review and approve FR-DEP-006 as a leaf requirement.</todo>

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===== Issues =====

<todo>Determine whether separate requirements define the conditions that initiate Deployment Rollback.</todo>

<todo>Determine whether separate requirements define the required result of Deployment Rollback.</todo>

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===== Notes for Editors =====

This requirement page retains the stable requirement identifier ''FR-DEP-006''.

This page is a leaf requirement page and omits a trailing '':start'' from its namespace.

The Statement preserves the approved source intent by requiring Crucible to perform Deployment Rollback.

Do not add automatic initiation, predeployment-state restoration, recovery, backup, replacement, validation, or rollback-record obligations unless the controlling requirement changes through an approved requirements process.

To reference this requirement Statement from another wiki page, insert:

<code dokuwiki>
{{section>dido:02-crusible:99-annexes:annex-c-requirements:03-functional-requirements:03-03-deployment-orchestration:fr-dep-006#Statement&noheader&nofooter&noeditbtn}}
</code>

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