# Raises an error if header authentication config is missing regex rule
karma.bin-should-fail --log.format=text --log.config=false --log.level=error --config.file=karma.yaml
! stdout .
stderr 'msg="authentication.header.value_re is required when authentication.header.name is set"'

-- karma.yaml --
alertmanager:
  servers:
    - name: default
      uri: https://localhost:9093
authentication:
  header:
    name: "foo"
