[FR] Force type when doing environment variable substitution

[flyfire2002]

Component(s)

processor/resource

Is your feature request related to a problem? Please describe.

When substituting env variables like "00001" (as a string) (e.g. into an attribute), the type of the produced value is automatically Int. This causes leading 0s to be stripped. (i.e. result is Int(1)) I want to be able to force it to type Str at substitution.

Describe the solution you'd like

Be able to declare type when substituting environment vars.

Describe alternatives you've considered

attribute: convert: it is done after the value is already substituted as an Int, so in this case it will be doing Int(1) => Str(1), which is still not the same as Str(00001).

Additional context

With config

  resource/common_labels:
    attributes:
    - key: some_id
      value: "${id}"
      action: upsert

When the env var id = "00001", the value of the attribute "some_id" will be Int(1).
If we do a

    - key: some_id
      action: convert
      converted_type: string

afterwards, the value is Str(1) which is still different from "00001" / Str(00001).

[github-actions]

Pinging code owners:

• processor/resource: @dmitryax

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