Error out if labeldrop/labelkeep are used with source_labels

[brian-brazil]

This is non-nonsensical, so catch it when we parse the relabelling config.

[juliusv]

Same for target labels, regex, modulus, separator, right?

[brian-brazil]

We require the regex, nothing else should be non-default.

[roman-vynar]

I agree as this is a bit confusing ref
Usually, you have label names under source_labels and compare their values in regex.
With labeldrop, you put label names into regex.

[juliusv]

Right, don't know how "regex" made it into my list :)

But yeah, the many conditionally used fields in relabeling are getting a bit confusing.

[lock]

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