feat: use OTel semconv constants for feature flag attributes

[abisecops]

This PR

• Replaces locally defined feature flag attribute constants in the telemetry package with references to OpenTelemetry semantic conventions (semconv).
• Reduces maintenance and ensures alignment with OTel updates.
• Removes redundant constant definitions.

Related Issues

Fixes open-feature/go-sdk#393

Notes

This change ensures the telemetry package uses standardized OTel feature flag attributes, making future updates easier and improving interoperability.

Follow-up Tasks

• Review other usages of feature flag attributes for possible refactoring.
• Monitor for updates in OTel semconv that may affect attribute usage.

How to test

• Run unit and integration tests to verify telemetry events are emitted with correct attribute keys.
• Check that no custom constants for feature flag attributes remain in the telemetry package.

[gemini-code-assist[bot]]

Summary of Changes

Hello @abisecops, I'm Gemini Code Assist[^1]! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refactors the telemetry package to align with OpenTelemetry semantic conventions for feature flag attributes. By replacing locally defined constants with semconv references, the change aims to enhance standardization, reduce maintenance overhead, and improve interoperability with the broader OpenTelemetry ecosystem. This ensures that telemetry events are consistently structured and easily consumable by OTel-compliant systems.

Highlights

• Standardized Telemetry Attributes: Replaced custom feature flag attribute constants in the telemetry package with references to OpenTelemetry semantic conventions (semconv).
• Improved Maintainability: This change reduces the need for local maintenance of these constants and ensures automatic alignment with future OTel updates, removing redundant definitions.
• Dependency Updates: Updated go.mod and go.sum to include github.com/stretchr/testify v1.11.1 and other dependency adjustments.

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[aepfli]

Since all the attributes are already well-defined in the semantic conventions (semconv), the telemetry package doesn’t provide much value to go-sdk. I believe any remaining useful parts should be moved to go-sdk-contrib/hooks/open-telemetry, and the telemetry package should be removed from go-sdk.

I am not sure, if that should be the case, because it seems like we do this in all the SDK's for easy access to telemetric information. I think we should revisit this approach in general, because we add a dependency on the otel semconv to the base sdk, which might not be ideal anyways. - here https://github.com/open-feature/.github/issues/65 - this was defined

[erka]

@abisecops Could you please double-check your work? It looks like the tests aren’t passing.

[beeme1mr]

@sahidvelji also has a draft PR open. We should align on this as soon as possible. I'd like to get the OTel support in a good place before KubeCon.

https://github.com/open-feature/go-sdk/pull/418