message: Exclude the external label when creating a silence from the dev perspective
  Fixes: https://bugzilla.redhat.com/show_bug.cgi\?id\=2084504
diff: @@ -35,6 +35,8 @@ const durations = {
  '1d': '1 day',
  };
  +const externalLabelFilter = ({ name }: { name: string }) => name !== 'prometheus';
  +
  const SilenceDurationDropDown: React.FC<SilenceDurationDropDownProps> = ({
  rule,
  silenceInProgress,
  @@ -54,7 +56,7 @@ const SilenceDurationDropDown: React.FC<SilenceDurationDropDownProps> = ({
  value: rule.name,
  },
  ...ruleMatchers,
  - ];
  + ].filter(externalLabelFilter);
  const setDuration = (duration: string) => {
  const startsAt = new Date();
  