diff --git a/semantic_conventions/lib/opentelemetry/semantic_conventions.rb b/semantic_conventions/lib/opentelemetry/semantic_conventions.rb
index a5c118072..532b2ab69 100644
--- a/semantic_conventions/lib/opentelemetry/semantic_conventions.rb
+++ b/semantic_conventions/lib/opentelemetry/semantic_conventions.rb
@@ -12,3 +12,4 @@ module SemanticConventions
 
 require_relative 'semantic_conventions/trace'
 require_relative 'semantic_conventions/resource'
+require_relative 'semantic_conventions/stability_mode'
diff --git a/semantic_conventions/lib/opentelemetry/semantic_conventions/stability_mode.rb b/semantic_conventions/lib/opentelemetry/semantic_conventions/stability_mode.rb
new file mode 100644
index 000000000..88668f45d
--- /dev/null
+++ b/semantic_conventions/lib/opentelemetry/semantic_conventions/stability_mode.rb
@@ -0,0 +1,164 @@
+# frozen_string_literal: true
+
+# Copyright The OpenTelemetry Authors
+#
+# SPDX-License-Identifier: Apache-2.0
+
+module OpenTelemetry
+  module SemanticConventions
+    # The `StabilityMode` class controls which semantic conventions are emitted.
+    #
+    # For more information on semantic conventions stability, refer to 
+    # {https://opentelemetry.io/docs/specs/otel/versioning-and-stability/#semantic-conventions-stability OpenTelemetry documentation}. 
+    #
+    # ## Configuration
+    # The `StabilityMode` class relies on the `OTEL_SEMCONV_STABILITY_OPT_IN` environment variable, a comma-delimited string of stability modes to opt into. 
+    # 
+    # Currently, `OTEL_SEMCONV_STABILITY_OPT_IN` only supports {https://opentelemetry.io/docs/specs/semconv/http/ semantic conventions for HTTP}. 
+    # The values defined for `OTEL_SEMCONV_STABILITY_OPT_IN` are:
+    #   - `http`: Emit stable HTTP and networking conventions ONLY
+    #   - `http/dup`: Emit both old and stable HTTP and networking conventions
+    #   - `default`: Emit old conventions ONLY
+    #
+    # If no `OTEL_SEMCONV_STABILITY_OPT_IN` is set, the `default` behavior is used. `http/dup` has higher precedence than `http` in case both values are present.
+    #
+    # For instrumentation authors of libraries that emit HTTP semantic conventions, it is recommended to use the helper methods provided by this class to assign 
+    # attributes on span to support the opt-in preference of users. This class provides one method per convention and each method accepts at least two arguments. The 
+    # first is a hash to add the attribute(s) to. Additional arguments make up the value. The return value is nil, but the hash that was passed in will be updated.
+    # 
+    # Example usage:
+    # ```ruby
+    # result = {} # Hash to add attributes to
+    # stability_mode = OpenTelemetry::SemanticConventions::StabilityMode.new
+    # stability_mode.set_http_status_code(result, 200)
+    # 
+    # span.add_attributes(result) # Add the attributes to the span
+    # ```
+    class StabilityMode
+      OTEL_SEMCONV_STABILITY_OPT_IN = 'OTEL_SEMCONV_STABILITY_OPT_IN'
+
+      DEFAULT = 'default'
+      HTTP = 'http'
+      HTTP_DUP = 'http/dup'
+
+      # These constants will be pulled in from elsehwere once semvconv stability PR merged
+      # https://github.com/open-telemetry/opentelemetry-ruby/pull/1651
+      HTTP_REQUEST_METHOD = 'http.request.method'
+      HTTP_RESPONSE_STATUS_CODE = 'http.response.status_code'
+      URL_SCHEME = 'url.scheme'
+      URL_PATH = 'url.path'
+      URL_QUERY = 'url.query'
+      URL_FULL = 'url.full'
+      SERVER_ADDRESS = 'server.address'
+      SERVER_PORT = 'server.port'
+
+      attr_accessor :initialized, :lock, :otel_semconv_stability_signal_mapping
+
+      def initialize
+        @lock = Mutex.new
+        @otel_semconv_stability_signal_mapping = {}
+
+        @lock.synchronize do
+          opt_in = ENV.fetch('OTEL_SEMCONV_STABILITY_OPT_IN', nil)
+          opt_in_list = opt_in.split(',').map(&:strip) if opt_in
+          http_set_sability_mode(opt_in_list) if opt_in_list
+        end
+      end
+
+      def http_set_sability_mode(opt_in_list)
+        return unless opt_in_list.include?(HTTP) || opt_in_list.include?(HTTP_DUP)
+
+        http_opt_in = DEFAULT
+        if opt_in_list.include?(HTTP_DUP) # http/dup takes priority over http
+          http_opt_in = HTTP_DUP
+        elsif opt_in_list.include?(HTTP)
+          http_opt_in = HTTP
+        end
+        otel_semconv_stability_signal_mapping['http'] = http_opt_in
+      end
+
+      def report_new?(opt_in_mode)
+        otel_semconv_stability_signal_mapping[opt_in_mode] != DEFAULT
+      end
+
+      def report_old?(opt_in_mode)
+        otel_semconv_stability_signal_mapping[opt_in_mode] != HTTP
+      end
+
+      def set_string_attribute(result, key, value)
+        result[key] = String(value) if value
+      end
+
+      def set_int_attribute(result, key, value)
+        result[key] = Integer(value) if value
+      end
+
+      # Sets the HTTP method attribute in the `result` hash.
+      #
+      # @param [Hash] result The result hash.
+      # @param [String] request_method The HTTP request method.
+      def set_http_method(result, request_method)
+        set_string_attribute(result, OpenTelemetry::SemanticConventions::Trace::HTTP_METHOD, request_method) if report_old?(HTTP)
+        set_string_attribute(result, HTTP_REQUEST_METHOD, request_method) if report_new?(HTTP)
+      end
+
+      # Sets the HTTP status code attribute in the result hash.
+      #
+      # @param [Hash] result The result hash.
+      # @param [Integer] code The HTTP status code.
+      def set_http_status_code(result, code)
+        set_int_attribute(result, OpenTelemetry::SemanticConventions::Trace::HTTP_STATUS_CODE, code) if report_old?(HTTP)
+        set_int_attribute(result, HTTP_RESPONSE_STATUS_CODE, code) if report_new?(HTTP)
+      end
+
+      # Sets the HTTP URL attribute in the result hash.
+      #
+      # @param [Hash] result The result hash.
+      # @param [String] url The HTTP URL.
+      def set_http_url(result, url)
+        set_string_attribute(result, OpenTelemetry::SemanticConventions::Trace::HTTP_URL, url) if report_old?(HTTP)
+        set_string_attribute(result, URL_FULL, url) if report_new?(HTTP)
+      end
+
+      # Sets the HTTP scheme attribute in the result hash.
+      #
+      # @param [Hash] result The result hash.
+      # @param [String] scheme The HTTP scheme.
+      def set_http_scheme(result, scheme)
+        set_string_attribute(result, OpenTelemetry::SemanticConventions::Trace::HTTP_SCHEME, scheme) if report_old?(HTTP)
+        set_string_attribute(result, URL_SCHEME, scheme) if report_new?(HTTP)
+      end
+
+      # Sets the server address attribute in the result hash for client requests.
+      #
+      # @param [Hash] result The result hash.
+      # @param [String] peer_name The server address.
+      def set_http_net_peer_name_client(result, peer_name)
+        set_string_attribute(result, OpenTelemetry::SemanticConventions::Trace::NET_PEER_NAME, peer_name) if report_old?(HTTP)
+        set_string_attribute(result, SERVER_ADDRESS, peer_name) if report_new?(HTTP)
+      end
+
+      # Sets the server port attribute in the result hash for client requests.
+      #
+      # @param [Hash] result The result hash.
+      # @param [Integer] port The server port.
+      def set_http_peer_port_client(result, port)
+        set_int_attribute(result, OpenTelemetry::SemanticConventions::Trace::NET_PEER_PORT, port) if report_old?(HTTP)
+        set_int_attribute(result, SERVER_PORT, port) if report_new?(HTTP)
+      end
+
+      # Sets the HTTP target attribute in the result hash.
+      #
+      # @param [Hash] result The result hash.
+      # @param [String] path The URL path.
+      # @param [String] query The URL query.
+      def set_http_target(result, path, query)
+        set_string_attribute(result, OpenTelemetry::SemanticConventions::Trace::HTTP_TARGET, path) if report_old?(HTTP)
+        return unless report_new?(HTTP)
+
+        set_string_attribute(result, URL_PATH, path)
+        set_string_attribute(result, URL_QUERY, query)
+      end
+    end
+  end
+end
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