[procesor/groupbyattrsprocessor]: fix droping metadata when processing metrics

open-telemetry / opentelemetry-collector-contrib

Contrib repository for the OpenTelemetry Collector

https://opentelemetry.io

Apache License 2.0

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Open odubajDT opened 2 days ago

odubajDT commented 2 days ago

Description: Fixes the metadata dropping when processing metrics

Link to tracking Issue: #33419

Testing: