pint.error --no-color lint --fail-on=warning --min-severity=bug rules
! stdout .
cmp stderr stderr.txt

-- rules/0001.yml --
groups:
  - name: foo
    rules:
    - alert: foo
      expr: up{job="xxx"}

-- stderr.txt --
level=info msg="Problems found" Warning=1
level=info msg="1 problem(s) not visible because of --min-severity=bug flag"
level=fatal msg="Fatal error" error="found 1 problem(s) with severity Warning or higher"
