Promtail 2.3.0 - Label filtering no longer works with match stage

Grafana Loki
1

I have the following match stage in my Promtail configuration:

  - match:
      selector: '{loglevel="ERROR"} !~ <bunch of regex>  | type != "usage" and type != "repair"'
      stages:
      - template:
          source: errorCorrected
          template: 'corrected'
      - labels:
          errorCorrected:
      - metrics:
          errors_corr:
            type: counter
            description: "Corrected total number of error messages"
            prefix: app_log_
            max_idle_duration: 24h
            source: loglevel
            config:
              match_all: true
              action: inc

With Promtail 2.3.0, I get the following error when loading this config:

invalid match stage config: invalid selector syntax for match stage: parse error at line 1, col 164: syntax error: unexpected IDENTIFIER, expecting != or !~ or |~ or |=

Column 164 corresponds to the | character in the above selector LogQL query.

This config worked without issues on Promtail 2.2.0. Are label filters no longer allowed in the selector for the match pipeline stage?

Thanks.

2

Experiencing the same problem – how did you resolve?
The odd thing is that the query works from Grafana direct, but not as a selector/label filter in Promtail config.

3

Hey, thanks for reminding me to post back. Yes, I did resolve! Basically, I moved the label filter right to the beginning of the selector. So my match line now looks as follows:

  - match
      selector: '{loglevel="ERROR",type!="usage",type!="repair"} !~ <bunch of regex>
      stages:
        ...

It works with Promtail 2.3 and 2.4. Hope this helps you. Thanks!

4

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