[processor/metricstransform] Include Splitby operation

[MovieStoreGuy]

Component(s)

processor/metricstransform

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

In the components current form, it is not possible without some complicated aggregation logic to convert an attribute to a new metric.

Describe the solution you'd like

What I'd like to do is the following:

processors:
   metricstransform:
      transform:
      - include: system.cpu.utilization
        action: update
        operations:
        - action: split_metric
          new_name: cpu.idle # potential worth reusing `new_value`
          label: state
          label_value: idle

Describe alternatives you've considered

At this point in time, to make split_metric logic work, I have either done some combination of label aggregation or using the signalfx exporter to perform this operation.

Additional context

While A solution exists and works, it is split across two components so keeping metric names consistent across different systems isn't possible.

[github-actions]

Pinging code owners:

• processor/metricstransform: @dmitryax

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

[dmitryax]

I think this should be implemented as new functionality in the transform processor instead of metricstransform processor. @TylerHelmuth do you have any ideas on how this can be done?

[TylerHelmuth]

I'm struggle to imaging what it's like to build a metric out of an attribute, but I'm sure the transform processor could be made to do it now.

[MovieStoreGuy]

I'm struggle to imaging what it's like to build a metric out of an attribute, but I'm sure the transform processor could be made to do it now.

We are currently using the SignalFx Exporter to do this for us, but effectively the logic is:

if v, exist := dp.attributes.Get(operation.Label); exist && v.AsString() == operation.LabelValue {
   m := NewMetric()
   dp.CopyTo(m) 
   dps.Remove(dp)
   m.SetName(operation.NewName)
   m.Attributes.Remove(operation.Label)
   m.CopyTo(dps.AppendEmpty())
}

[TylerHelmuth]

Yes I think a function could be added to do that. It would probably be best to do it at the Metric context, but it's possible to do at the DataPoint Context. The caveat with doing it at the datapoint level is that you shouldn't remove items from the datapoint list.

[MovieStoreGuy]

That is fair, it would help unblock our dependancy on signalfx exporter performing this operation.

[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.

[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.

[github-actions]

This issue has been closed as inactive because it has been stale for 120 days with no activity.