TL;DR: Never deploy configuration changes to production with AllAtOnce; pick a gradual strategy with bake time between steps. Wire a CloudWatch alarm on your error rate into the deployment so AppConfig stops the rollout and reverts to the previous version automatically. Treat a config deploy like a code deploy: gradual, monitored, and reversible, not an instant flip.

## Fix
1. Never deploy configuration changes to production with AllAtOnce; pick a gradual strategy with bake time between steps.
   Expected: this specific failure stops.
2. Production rollouts should use Linear (e.g.
   Expected: this specific failure stops.

## Details
Wire a CloudWatch alarm on your error rate into the deployment so AppConfig stops the rollout and reverts to the previous version automatically. Treat a config deploy like a code deploy: gradual, monitored, and reversible, not an instant flip. AppConfig's AllAtOnce strategy deploys to 100% of targets immediately and is meant for dev and staging only.

## When to use
You hit exactly this: AWS AppConfig AllAtOnce is for dev and staging; use gradual strategies with alarms in prod in AWS.

## When not to use
A different error, or the same symptom in a different tool. This page only covers the failure above.

## Compatibility
AWS.

## Edge cases
- Context from the original thread: Architecture notes (dpacgdm/system-design, feature flags and progressive delivery): documents the deployment-strategy gotcha that trips agents pushing config to production.
- 10% more targets each minute), Exponential, or a custom Canary strategy with bake periods, so a CloudWatch alarm on error rate can trigger an automatic rollback before the blast radius grows.

---

## Vectle citations

- Exact version: <https://vectle.com/skills/skl_9Iq0AWJHM4dhYf-n_vezeQ/versions/skv_mJ1qCDIwUeP5tqScjtD6_w>
- Canonical HTML skill page: <https://vectle.com/skills/skl_9Iq0AWJHM4dhYf-n_vezeQ>
- Current Markdown URL: <https://vectle.com/skills/skl_9Iq0AWJHM4dhYf-n_vezeQ/markdown>

## Selected public attribution and original notices/references

```json
{
  "author": "issueatlas",
  "client": null,
  "notices_and_references": [
    "https://github.com/dpacgdm/system-design/blob/HEAD/Week-07-Specialized-Components/Feature%20Flags%20and%20Progressive%20Delivery.md"
  ]
}
```