[processor/metricstransform] Aggregate Labels no longer supports aggregating all labels #35120
Description
Component(s)
internal/core, processor/metricstransform
What happened?
Description
In the past, we could use the metrics transformer to aggregate datapoints on any label.
The configuration listed below used to work as is.
Now this is no longer the case
Steps to Reproduce
Setup OTEL to consume a metric with multiple datapoints having different label values.
Use the configuration below.
On version v0.90.1 (up to v105), it should aggregate the datapoints.
On the latest version (starting v106), it will not aggregate the values.
Config
metricstransform:
transforms:
- include: my.metric
match_type: strict
action: update
operations:
- action: aggregate_labels
label_set: [ ] # In the past, we could have an empty array.
aggregation_type: sum
Expected Result
Aggregation of results
Actual Result
No aggregation happens.
Anaylsis
The behavior changed with the following code change:
Collector version
v0.107.0 (also v0.108)
Environment information
Environment
OS: (e.g., "Ubuntu 20.04")
Compiler(if manually compiled): (e.g., "go 14.2")
OpenTelemetry Collector configuration
No response
Log output
No response
Additional context
No response