replace_all_patterns function for attribute keys doesn not expand regex

[vainiusd]

Component(s)

processor/transform

What happened?

Description

replace_all_patterns function does not support regex expand replacement for attribute keys

Steps to Reproduce

processors:
  transform:
    error_mode: ignore
    metric_statements:
      - context: datapoint
        statements:
          - replace_all_patterns(attributes, "key", "^dimension_(.+)", "$$1")

Expected Result

Attributes:
     -> dimension_A: Str() ==> This should change attr key to A from dimension_A 
     -> dimension_B: Str() ==> This should change attr key to B from dimension_B

Actual Result

Attributes:
     -> key_1: Str()

Collector version

v0.77.0

Environment information

Environment

OS: (e.g., "Ubuntu 20.04")
Compiler(if manually compiled): (e.g., "go 14.2")

OpenTelemetry Collector configuration

processors:
  transform:
    error_mode: ignore
    metric_statements:
      - context: datapoint
        statements:
          - replace_all_patterns(attributes, "key", "^dimension_(.+)", "$$1")

Log output

no response

Additional context

Function implementation differs for attribute keys and values. Is there a specific reason for that?

Values: ReplaceAllString
Keys: ReplaceAllLiteralString

Use case: bulk rename of attributes.

[github-actions]

Pinging code owners:

• processor/transform: @TylerHelmuth @kentquirk @bogdandrutu @evan-bradley

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[evan-bradley]

Thanks for reporting this. It looks like switching to ReplaceAllString was missed when implementing this. I'll have a fix out shortly.