feat({ddtrace/opentelemetry,internal/version}): remove Masterminds/semver/v3

[darccio]

What does this PR do?

Removes Mastermind/semver/v3 using golang.org/x/mod/semver where appropriate. Custom code to parse a version string has been introduced. Existing tests are passing without modification (only adding new tests).

Stacked on #4181. Please review the following commits:

• 49848be228fd04fde585be23d4a1793e1de8b5f9
• f84d62a6ec81a6974d4b578ec23adf3fd9c13fd2

Motivation

Reducing the scope of our dependencies.

Performance

Old

goos: darwin
goarch: arm64
pkg: github.com/DataDog/dd-trace-go/v2/internal/version
cpu: Apple M1 Max
BenchmarkParseVersion-10    	 2455150	       486.8 ns/op	     467 B/op	       5 allocs/op
PASS
ok  	github.com/DataDog/dd-trace-go/v2/internal/version	1.575s

New

goos: darwin
goarch: arm64
pkg: github.com/DataDog/dd-trace-go/v2/internal/version
cpu: Apple M1 Max
BenchmarkParseVersion-10    	19296534	        55.26 ns/op	       0 B/op	       0 allocs/op
PASS
ok  	github.com/DataDog/dd-trace-go/v2/internal/version	1.575s

Reviewer's Checklist

• Changed code has unit tests for its functionality at or near 100% coverage.
• System-Tests covering this feature have been added and enabled with the va.b.c-dev version tag.
• There is a benchmark for any new code, or changes to existing code.
• If this interacts with the agent in a new way, a system test has been added.
• New code is free of linting errors. You can check this by running ./scripts/lint.sh locally.
• Add an appropriate team label so this PR gets put in the right place for the release notes.
• Non-trivial go.mod changes, e.g. adding new modules, are reviewed by @DataDog/dd-trace-go-guild.

Unsure? Have a question? Request a review!

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-11-27 16:46:34

Comparing candidate commit aa0aa13 in PR branch dario.castane/apmlp-494/masterminds-semver with baseline commit 65039e2 in branch dario.castane/apmlp-494/mapstructure.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 3 metrics, 0 unstable metrics.

[genesor]

Why was this needed before and not anymore ?

In the go.mod of the tracer we have a dependency on v0.49.0

[darccio]

This was a temporary solution. It was done in #3551.

I realize that I didn't check the otelhttp version, but apparently... The smoke tests are passing. I think they did some significant back-and-forth changes between v0.61.0 and v0.63.0:

v0.61.0 (link)

Remove support for the OTEL_SEMCONV_STABILITY_OPT_IN environment variable as well as support for semantic conventions v1.20.0 in the modules below. (open-telemetry/opentelemetry-go-contrib#7584)
go.opentelemetry.io/contrib/instrumentation/github.com/emicklei/go-restful/otelrestful
go.opentelemetry.io/contrib/instrumentation/github.com/gin-gonic/gin/otelgin
go.opentelemetry.io/contrib/instrumentation/github.com/gorilla/mux/otelmux
go.opentelemetry.io/contrib/instrumentation/github.com/labstack/echo/otelecho
go.opentelemetry.io/contrib/instrumentation/net/http/httptrace/otelhttptrace
go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp

v0.62.0 (link)

The semantic conventions have been upgraded from v1.26.0 to v1.34.0 in go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp. (open-telemetry/opentelemetry-go-contrib#7383, open-telemetry/opentelemetry-go-contrib#7484)

v0.63.0 (link)

Switched the default for OTEL_SEMCONV_STABILITY_OPT_IN to emit the v1.26.0 semantic conventions by default in the following modules.

go.opentelemetry.io/contrib/instrumentation/github.com/emicklei/go-restful/otelrestful
go.opentelemetry.io/contrib/instrumentation/github.com/gin-gonic/gin/otelgin
go.opentelemetry.io/contrib/instrumentation/github.com/gorilla/mux/otelmux
go.opentelemetry.io/contrib/instrumentation/github.com/labstack/echo/otelecho
go.opentelemetry.io/contrib/instrumentation/net/http/httptrace/otelhttptrace
go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp
The OTEL_SEMCONV_STABILITY_OPT_IN=http/dup environment variable can be still used to emit both the v1.20.0 and v1.26.0 semantic conventions.
It is however impossible to emit only the 1.20.0 semantic conventions, as the next release will drop support for that environment variable. (open-telemetry/opentelemetry-go-contrib#6899)

[darccio]

/merge

[dd-devflow-routing-codex]

View all feedbacks in Devflow UI.

2025-11-28 14:34:54 UTC ℹ️ Start processing command /merge

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2025-11-28 14:34:57 UTC ℹ️ MergeQueue: pull request added to the queue

The expected merge time in dario.castane/apmlp-494/mapstructure is approximately 0s (p90).

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2025-11-28 15:25:27 UTC ℹ️ MergeQueue: This merge request was merged