Turn off color explicitly

[cshen-dev]

Hi slog community!
I've been using qdrant as my vector store and it uses slog according to their Cargo.toml. However, as a rust newbie, I have no idea how to disable the colors in logging by setting some environment variables such as no_color=true.

Is that a lacking feature from slog-term or am I missing the document?

[dpc]

I don't think slog-term respects NO_COLOR and it probably should.