include the otel header-only part directly for ease of use

ext/opentelemetry-cpp-api-only/include/opentelemetry/semconv/server_attributes.h

@@ -0,0 +1,41 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/*
+ * DO NOT EDIT, this is an Auto-generated file from:
+ * buildscripts/semantic-convention/templates/registry/semantic_attributes-h.j2
+ */
+
+#pragma once
+
+#include "opentelemetry/common/macros.h"
+#include "opentelemetry/version.h"
+
+OPENTELEMETRY_BEGIN_NAMESPACE
+namespace semconv
+{
+namespace server
+{
+
+/**
+  Server domain name if available without reverse DNS lookup; otherwise, IP address or Unix domain
+  socket name. <p> When observed from the client side, and when communicating through an
+  intermediary, @code server.address @endcode SHOULD represent the server address behind any
+  intermediaries, for example proxies, if it's available.
+ */
+static constexpr const char *kServerAddress = "server.address";
+
+/**
+  Server port number.
+  <p>
+  When observed from the client side, and when communicating through an intermediary, @code
+  server.port @endcode SHOULD represent the server port behind any intermediaries, for example
+  proxies, if it's available.
+ */
+static constexpr const char *kServerPort = "server.port";
+
+}  // namespace server
+}  // namespace semconv
+OPENTELEMETRY_END_NAMESPACE