ADD userguide/managingApp/rolling-back-a-deployment

docs/content/en/docs-v1.0.x/user-guide/managing-application/rolling-back-a-deployment.md

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+---
+title: "Rolling back a deployment"
+linkTitle: "Rolling back a deployment"
+weight: 6
+description: >
+  This page describes when a deployment is rolled back automatically and how to manually roll back a deployment.
+---
+
+Rollbacks allow you to revert your application to a previous stable state when something goes wrong during deployment. PipeCD supports both automatic and manual rollbacks, giving you flexibility in handling deployment failures.
+
+## Automatic rollback
+You can automate rollbacks by enabling the `autoRollback` field in your application configuration:
+
+```bash
+spec:
+  pipeline:
+    stages:
+      - name: K8S_CANARY_ROLLOUT
+      - name: K8S_PRIMARY_ROLLOUT
+  autoRollback: true
+```
+
+When `autoRollback` is enabled, the deployment will be rolled back if any of the following conditions are met:
+
+- A deployment pipeline stage fails
+- An analysis stage determines that the deployment has a negative impact
+- An error occurs while deploying
+
+If a rollback is triggered, PipeCD adds a new `ROLLBACK` stage to the deployment pipeline and reverts all applied changes.
+
+## Manual rollback
+
+If you need to roll back a deployment that has already completed, or want to intervene during a deployment which is in-progress, you can trigger a rollback manually from the Web UI by clicking the `Cancel with Rollback` button.
+
+![Screenshot of rolling back a deployment](/images/rolled-back-deployment.png)
+<p style="text-align: center;">
+A deployment bring rolled back
+</p>