[extension/opamp] Add support for user-specified non-identifying attributes

[BinaryFissionGames]

Component(s)

extension/opamp

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

In the OpAMP spec, non-identifying attributes include "any user-defined attributes that the end user would like to associate with this Agent."

We would like to be able to add some extra attributes to the agent description this way.

Describe the solution you'd like

I think a simple solution would be to just have a section of the config that unmarshals to map[string]string, where the attributes can be specified:

extension:
  opamp:
    non_identifying_attributes:
      custom.attribute: value
      another.custom.attribute: "another value"

If one of the automatically filled non identifying attributes are specified (e.g. host.name, host.arch, os.type), I think the user-specified value of the attribute should act as an override for these attributes.

Describe alternatives you've considered

No response

Additional context

No response

[github-actions]

Pinging code owners:

• extension/opamp: @portertech @evan-bradley @tigrannajaryan

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[evan-bradley]

Sounds good to me. I can't think of any reasons why we shouldn't add this.