keep_matching_keys function not working with metric context

[Shindek77]

Hello Community, is keep_matching_keys ottl function doest not work for metric context as i am using it but it is not working properly. Gives error on otel as processors::transform/test: unable to parse OTTL statement "keep_matching_keys(attributes,"^(url|http|service|cloud|event).")": undefined function "keep_matching_keys" . Please help me on this transform/test:
metric_statements:
- context: metric
statements:
- keep_matching_keys(attributes, "^(url|http|service|cloud|event).")
- keep_matching_keys(resource.attributes, "^(url|http|service|cloud|event).*").