Add http-metrics to semantic conventions (#2976)

* sem

* lint

Author: lzchen

Diff for: CHANGELOG.md

@@ -11,6 +11,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   ([#2947](https://github.com/open-telemetry/opentelemetry-python/pull/2947))
 - `exporter-otlp-proto-http`: add user agent string
   ([#2959](https://github.com/open-telemetry/opentelemetry-python/pull/2959))
+- Add http-metric instrument names to semantic conventions
+  ([#2976](https://github.com/open-telemetry/opentelemetry-python/pull/2976))
 
 ## [1.13.0-0.34b0](https://github.com/open-telemetry/opentelemetry-python/releases/tag/v1.13.0) - 2022-09-26
 

Diff for: opentelemetry-semantic-conventions/src/opentelemetry/semconv/metrics/__init__.py

@@ -0,0 +1,32 @@
+# Copyright The OpenTelemetry Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# pylint: disable=too-many-lines
+
+
+class MetricInstruments:
+
+    HTTP_SERVER_DURATION = "http.server.duration"
+
+    HTTP_SERVER_REQUEST_SIZE = "http.server.request.size"
+
+    HTTP_SERVER_RESPONSE_SIZE = "http.server.response.size"
+
+    HTTP_SERVER_ACTIVE_REQUESTS = "http.server.active_requests"
+
+    HTTP_CLIENT_DURATION = "http.client.duration"
+
+    HTTP_CLIENT_REQUEST_SIZE = "http.client.request.size"
+
+    HTTP_CLIENT_RESPONSE_SIZE = "http.client.response.size"