# Raises an error if label custom color config is missing a value
karma.bin-should-fail --log.format=text --log.config=false --log.level=error --config.file=karma.yaml
! stdout .
stderr 'msg="Custom label color for ''region'' is missing ''value'' or ''value_re''"'

-- karma.yaml --
alertmanager:
  servers:
    - name: default
      uri: https://localhost:9093
labels:
  color:
    custom:
      region:
        - color: "#736598"
