align attributes and report env

[jay-418]

relates to https://github.com/getlantern/engineering/issues/3035

[Copilot]

Pull request overview

Updates Lantern Box telemetry to use the shared github.com/getlantern/semconv attribute set and adds build/version reporting to OTEL resources (relates to engineering issue #3035).

Changes:

• Replaces direct OpenTelemetry semconv usage with github.com/getlantern/semconv in tracker + otel packages.
• Enriches proxy connection metrics/spans with additional semantic attributes (including client info).
• Adds service.version to the OTEL resource using VCS build metadata.

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
tracker/metrics/tracker.go	Switches to shared semconv keys and adds client-info enrichment to metric attributes and correlation span attributes.
otel/otel.go	Uses shared semconv and adds service.version derived from build info to the OTEL resource.
otel/otel_test.go	Updates semconv import to shared module for resource attribute assertions.
go.mod	Bumps github.com/getlantern/semconv and updates some OTel module versions.
go.sum	Updates checksums for bumped dependencies.
AGENTS.md	Documents repository guidance to follow shared semconv rules for telemetry attributes.

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[reflog]

@jay-418 in general - ok. but can you comment on the cardinality issue that copilot picked up?

[jay-418]

@jay-418 in general - ok. but can you comment on the cardinality issue that copilot picked up?

@reflog I've refactored some, but for the cardinality aspect:

• sing.connections and sing.connetion_duration have had device_id removed
• proxy.io has kept device_id, because I think we need that data for business needs, if not operational, right?