[processor/metricstransform] support the ability to send a list of string as group_resource_labels

[luccabb]

Component(s)

processor/metricstransform

Is your feature request related to a problem? Please describe.

no

Describe the solution you'd like

I'ld like a solution that allows the workflow described here with a new option (maybe named group_resource_labels_list) where it takes a value of type map[string][]string

this is useful to add array of strings as attributes for matching metrics

Describe alternatives you've considered

No response

Additional context

No response

[github-actions]

Pinging code owners:

• processor/metricstransform: @dmitryax

See Adding Labels via Comments if you do not have permissions to add labels yourself.

[github-actions]

This issue has been inactive for 60 days. It will be closed in 60 days if there is no activity. To ping code owners by adding a component label, see Adding Labels via Comments, or if you are unsure of which component this issue relates to, please ping @open-telemetry/collector-contrib-triagers. If this issue is still relevant, please ping the code owners or leave a comment explaining why it is still relevant. Otherwise, please close it.

Pinging code owners:

• processor/metricstransform: @dmitryax

See Adding Labels via Comments if you do not have permissions to add labels yourself.