I have following issue with loki promtail. Here is one configuration snippet from my promtail:

        pipeline_stages:
          - cri: {}
          - regex:
              expression: '^(?P<time>.*?)|(?P<level>.*?)|(?P<process>.*?)|(?P<logger>.*?)|(?P<thread>.*?)|(?P<client>.*?)|(?P<user>.*?)|(?P<message>(?s:.*))$'
          - labels:
              level:
              logger:
              thread:
              client:
              user:
          - labeldrop:
              - filename
          - template:
              source: testo2
              template: '{{ .level }} - {{ .user }}'
          - output:
              source: testo2

I’m using the regex function to receive the required information. After it I create the labels.
For the final message I would like to overwrite the output.

My example of the output message: INFO – testo

The problem occurs in the template function. The variables are empty. Normally I thought I can use from the regex/label value to parse the variable inside the template.

What I’m doing wrong?

Thanks in advance.