With #92036, the Alerting team enabled the ability to filter on string parameters within our custom alert params. As a result, we should be able to use this to remove our internal_tags workaround for filtering on the immutable custom field. While immutable is a boolean, this fix leverages the flattened mapping under the hood, and so we should be able to use the string representation "true" or "false" to filter rules accordingly. e.g. alert.attributes.params.immutable:"true"

Testing real quick, I modified:

to be:

  const showCustomRuleFilter = filterOptions.showCustomRules
    ? [`alert.attributes.params.immutable: "false"`]
    : [];
  const showElasticRuleFilter = filterOptions.showElasticRules
    ? [`alert.attributes.params.immutable: "true"`]
    : [];

And this appears to work! 🎉

For more details on the internal_tags implementation, please see the original PR here: #52838