Loki 3.1.0 can not label the log level anymore

[Pamalosebi]

Describe the bug
I upgraded Loki to 3.1.0. Afterwards the log levels are not properly filtered / stored.

To Reproduce
Steps to reproduce the behavior:

1. Started Loki 3.1.0
2. Started Promtail 3.0.0
3. Query: sum by(level) (count_over_time({project="p1"} [$__auto]))

Expected behavior
The levels are still stored and returned correctly.

Environment:

• Infrastructure: Docker
• Deployment tool: Compose

Screenshots, Promtail config, or terminal output

As you see, the green before and after installing Loki 3.1.0 and the blue "only values" while using 3.1.0.

[Pamalosebi]

Could it come from this change? -> #13218

[jameshartig]

I think this was broken in 3.0. See #12839 (comment)

[Pamalosebi]

Still happening in v3.3.0...

Don't get me wrong. I want to like what Grafana Labs is doing. I used to love Grafana.
But I am getting a bit fed up. I cannot be alone with that feeling.