Initial QSfera import

Server/vendor/go.opentelemetry.io/otel/sdk/internal/x/features.go

@@ -0,0 +1,54 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+// Package x documents experimental features for [go.opentelemetry.io/otel/sdk].
+package x // import "go.opentelemetry.io/otel/sdk/internal/x"
+
+import "strings"
+
+// Resource is an experimental feature flag that defines if resource detectors
+// should be included experimental semantic conventions.
+//
+// To enable this feature set the OTEL_GO_X_RESOURCE environment variable
+// to the case-insensitive string value of "true" (i.e. "True" and "TRUE"
+// will also enable this).
+var Resource = newFeature(
+	[]string{"RESOURCE"},
+	func(v string) (string, bool) {
+		if strings.EqualFold(v, "true") {
+			return v, true
+		}
+		return "", false
+	},
+)
+
+// Observability is an experimental feature flag that determines if SDK
+// observability metrics are enabled.
+//
+// To enable this feature set the OTEL_GO_X_OBSERVABILITY environment variable
+// to the case-insensitive string value of "true" (i.e. "True" and "TRUE"
+// will also enable this).
+var Observability = newFeature(
+	[]string{"OBSERVABILITY", "SELF_OBSERVABILITY"},
+	func(v string) (string, bool) {
+		if strings.EqualFold(v, "true") {
+			return v, true
+		}
+		return "", false
+	},
+)
+
+// PerSeriesStartTimestamps is an experimental feature flag that determines if the SDK
+// uses the new Start Timestamps specification.
+//
+// To enable this feature set the OTEL_GO_X_PER_SERIES_START_TIMESTAMPS environment variable
+// to the case-insensitive string value of "true".
+var PerSeriesStartTimestamps = newFeature(
+	[]string{"PER_SERIES_START_TIMESTAMPS"},
+	func(v string) (bool, bool) {
+		if strings.EqualFold(v, "true") {
+			return true, true
+		}
+		return false, false
+	},
+)