medium:promtail.yaml.j2

promtail.yaml

pipeline_stages:
  - logfmt:
      mapping:
        timestamp: time
        level:
  - match:
...
  - match:
	    selector: '{job="exporters"}'
	    stages:
	        - regex:
	            source: service
	            expression: .+-(?P<environment>(stable|testing|unstable)$)
	        - labels:
	            environment:
  - template:
	    source: environment
        template: '{% raw %}{{ if .Value }}{{ .Value }}{{ else }}default{{ end }}{% endraw %}'