I was wondering whether I can provide a value in custom-value.yaml file in helm which is not there in the default values.yaml file or am I restricted to pass only the overrides. I could not find this information anywhere in the docs. Though I did a dry run with one of the charts and the COMPUTED VALUES showed me the variable which I seeded from my custom-values.yaml file and which was not there in the default values.yaml file. So it seems like we can pass anything in the custom-values.yaml file and not just the overrides.
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Yes, you can pass anything you want via helm install -f or helm install --set options; it doesn't specifically have to be something listed in the values.yaml file.
The reverse of this is that setting a value doesn't do anything unless the chart is specifically looking for it. For most public charts, there aren't undocumented values, and every possible setting is at least mentioned in the values.yaml file.
