add version file for autoprop propagator

CHANGELOG.md

@@ -19,6 +19,7 @@ The next release will require at least [Go 1.25].
 - Add `const Version` in `go.opentelemetry.io/contrib/detectors/azure/azurevm`. (#8553)
 - Add `const Version` in `go.opentelemetry.io/contrib/processors/baggagecopy`. (#8557)
 - Add `const Version` in `go.opentelemetry.io/contrib/detectors/aws/lambda`. (#8510)
+- Add `const Version` in `go.opentelemetry.io/contrib/propagators/autoprop`. (#8488)
 
 ### Fixed
 

propagators/autoprop/version.go

@@ -0,0 +1,7 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package autoprop // import "go.opentelemetry.io/contrib/propagators/autoprop"
+
+// Version is the current release version of the autoprop module.
+const Version = "0.65.0"

propagators/autoprop/version_test.go

@@ -0,0 +1,24 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package autoprop_test
+
+import (
+	"regexp"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"go.opentelemetry.io/contrib/propagators/autoprop"
+)
+
+// regex taken from https://semver.org/#is-there-a-suggested-regular-expression-regex-to-check-a-semver-string
+var versionRegex = regexp.MustCompile(`^(0|[1-9]\d*)\.(0|[1-9]\d*)\.(0|[1-9]\d*)` +
+	`(?:-((?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*)` +
+	`(?:\.(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*))*))?` +
+	`(?:\+([0-9a-zA-Z-]+(?:\.[0-9a-zA-Z-]+)*))?$`)
+
+func TestVersionSemver(t *testing.T) {
+	v := autoprop.Version
+	assert.NotNil(t, versionRegex.FindStringSubmatch(v), "version is not semver: %s", v)
+}