possibility to enable or disable force lowercase for labels on loki sink

[lat1992]

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Use Cases

I would like to discuss if it's a possibility to let users to chose if they want to lowercase all labels or not on loki sink.

Attempted Solutions

No response

Proposal

It could be an option on config file to set force lowercase or not.

References

https://github.com/vectordotdev/vector/blob/master/src/sinks/loki/sink.rs#L180
https://github.com/vectordotdev/vector/blob/master/src/common/expansion.rs#L9

Version

v0.48.0