Add span attrs "client_ver" and "client_platform".

server.go

@@ -102,6 +102,12 @@ func (server *RPCServer) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	versionHeader := r.Header.Get(server.versionHeader)
 	cltVersion, cltPlatform := parseVersionHeader(versionHeader)
 	cltIP := GetIP(r)
+
+	span.SetAttributes(
+		attribute.String("client_ver", cltVersion),
+		attribute.Int("client_platform", cltPlatform),
+	)
+
 	server.logger.V(1).Info("New request", "client_ver", cltVersion)
 
 	payload, err := readRequestBody(ctx, r.Body)