Need to add a Tag:environment to all metrics using opentelemetry collector

[debashish-github]

Hi,
I need to add envionrment tag to all my metrics using open-telemetry collector and while going through some search I figured out that it can be done using metrictransform processor as below :
metricstransform:
transforms:
include: .*
match_type: regexp
action: update
operations:
- action: add_label
new_label: env
new_value: perf

I have also attached m configuration . The open telemetry collector starts up fine but I don't see the env tag being added to any of the metrics ? Is there anything else that I need to do to get this working ?
Any help is greatly appreciated!
config.txt

Thanks[