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docs: add overrides in multi-source applications #25089

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11 changes: 11 additions & 0 deletions docs/user-guide/parameters.md
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Expand Up @@ -29,6 +29,17 @@ argocd app set guestbook -p ingress.hosts[0]=guestbook.myclusterurl
The `argocd app set` [command](./commands/argocd_app_set.md) supports more tool-specific flags such as `--kustomize-image`, `--jsonnet-ext-var-str`, etc.
You can also specify overrides directly in the source field on the application spec. Read more about supported options in the corresponding tool [documentation](./application_sources.md).

## Overrides in Multi-Source Applications

For multi-source applications, Argo CD allows you to override parameters for a specific source using the `--source-position` flag.
Each source in the application spec is indexed starting from `0`.

For example, to override a parameter in the **second source (index 1)** of a multi-source app:

```bash
argocd app set my-app --source-position 1 -p replicaCount=2
```

## When To Use Overrides?

The following are situations where parameter overrides would be useful:
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