Adding a LogError level

[theobat]

Was the "Error" level intentionally avoided in the LogLevel datatype ? If not can I make a PR to add it ?

[arybczak]

It was, Attention is Error pretty much.

[theobat]

But attention sounds like Warning and it seems like it's a different use case, no ? Overall what's the rationale for having less granular levels by default than say log4j for instance ? (I'm simply being curious here, no critique is intended)