# Raises an error if we have 2 instances with the same name (one using default name)
karma.bin-should-fail --log.format=text --log.config=false --log.level=error --config.file=karma.yaml
! stdout .
stderr 'msg="Failed to register Alertmanager ''default'' with URI ''https://localhost:9094'': alertmanager upstream ''default'' already exist"'

-- karma.yaml --
alertmanager:
  servers:
    - name: default
      uri: https://localhost:9093
    - uri: https://localhost:9094
