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docs: add soft documentation for ignoreMissingValueFiles #17996

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16 changes: 16 additions & 0 deletions docs/user-guide/helm.md
Expand Up @@ -72,6 +72,22 @@ source:
- values-production.yaml
```

If Helm is passed a non-existing value file during template expansion, it will error out. Missing
values files can be ignored (meaning, not passed to Helm) using the `--ignore-missing-value-files`. This can be
particularly helpful to implement a [default/override
pattern](https://github.com/argoproj/argo-cd/issues/7767#issue-1060611415) with [Application
Sets](./application-set.md).

In the declarative syntax:
```yaml
source:
helm:
valueFiles:
- values-common.yaml
- values-optional-override.yaml
ignoreMissingValueFiles: true
```

## Values

Argo CD supports the equivalent of a values file directly in the Application manifest using the `source.helm.valuesObject` key.
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