log_to_metric template tags

[arch-xtof]

Hello, I would like to reuse one log_to_metric transform for metrics with different tags. I don't know the names of the tags in advance but I know that they are defined under the .labels path.

Let's say I have the following events:

{"name": "apple_metric", "labels": {"color": "red"}},
{"name": "car_metric", "labels": {"manufacturer": "Audi"}}

and the following config

    [transforms.special_count_metrics]
      type = "log_to_metric"
      inputs = [ "..." ]

      [[transforms.special_count_metrics.metrics]]
        type = "counter"
        field = "..."
        name = "{{ name }}"
        namespace = "vector"
        increment_by_value = false

        [transforms.special_count_metrics.metrics.tags]
          # This would be the common tags
          env = "test"
          region = "cmh-1"

          # I need to template color and/or manufacturer here

How would I declare all fields defined under the .labels path as tags, Is this possible?

[arch-xtof]

I realized that both metric and log are just an object for Vector. I added one more transformation as a workaround.

    [transforms.special_count_metrics]
      ...
      [[transforms.special_count_metrics.metrics]]
       ...
        [transforms.special_count_metrics.metrics.tags]
          ...
          labels_hack = "{{ labels }}"

    [transforms.special_count_metrics_labeled]
      type = "remap"
      inputs = ["special_count_metrics"]
      source = '''
        dynamic_labels = .tags.labels_hack
        del(.tags.labels_hack)
        .tags = merge!(.tags, parse_json!(dynamic_labels))
      '''

It still would have been nice if there was a way with no extra steps, but I think, this will work just fine for me.