Remove http.target attr from ServerRequest (#3687)

* Remove http.target attr from ServerRequest

* Update changelog

* Remove trailing space in changelog

Author: MrAlias

CHANGELOG.md

@@ -13,6 +13,15 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 - Attribute `KeyValue` creations functions to `go.opentelemetry.io/otel/semconv/v1.17.0` for all non-enum semantic conventions.
   These functions ensure semantic convention type correctness.
 
+### Fixed
+
+- Removed the `http.target` attribute from being added by `ServerRequest` in the following packages. (#3687)
+  - `go.opentelemetry.io/otel/semconv/v1.13.0/httpconv`
+  - `go.opentelemetry.io/otel/semconv/v1.14.0/httpconv`
+  - `go.opentelemetry.io/otel/semconv/v1.15.0/httpconv`
+  - `go.opentelemetry.io/otel/semconv/v1.16.0/httpconv`
+  - `go.opentelemetry.io/otel/semconv/v1.17.0/httpconv`
+
 ### Removed
 
 - The deprecated `go.opentelemetry.io/otel/metric/instrument/asyncfloat64` package is removed. (#3631)

semconv/internal/v2/http.go

@@ -157,7 +157,14 @@ func (c *HTTPConv) ClientRequest(req *http.Request) []attribute.KeyValue {
 // "net.sock.peer.addr", "net.sock.peer.port", "http.user_agent", "enduser.id",
 // "http.client_ip".
 func (c *HTTPConv) ServerRequest(server string, req *http.Request) []attribute.KeyValue {
-	n := 5 // Method, scheme, target, proto, and host name.
+	// TODO: This currently does not add the specification required
+	// `http.target` attribute. It has too high of a cardinality to safely be
+	// added. An alternate should be added, or this comment removed, when it is
+	// addressed by the specification. If it is ultimately decided to continue
+	// not including the attribute, the HTTPTargetKey field of the HTTPConv
+	// should be removed as well.
+
+	n := 4 // Method, scheme, proto, and host name.
 	var host string
 	var p int
 	if server == "" {
@@ -199,14 +206,6 @@ func (c *HTTPConv) ServerRequest(server string, req *http.Request) []attribute.K
 	attrs = append(attrs, c.proto(req.Proto))
 	attrs = append(attrs, c.NetConv.HostName(host))
 
-	if req.URL != nil {
-		attrs = append(attrs, c.HTTPTargetKey.String(req.URL.RequestURI()))
-	} else {
-		// This should never occur if the request was generated by the net/http
-		// package. Fail gracefully, if it does though.
-		attrs = append(attrs, c.HTTPTargetKey.String(req.RequestURI))
-	}
-
 	if hostPort > 0 {
 		attrs = append(attrs, c.NetConv.HostPort(hostPort))
 	}

semconv/internal/v2/http_test.go

@@ -167,7 +167,6 @@ func TestHTTPServerRequest(t *testing.T) {
 	assert.ElementsMatch(t,
 		[]attribute.KeyValue{
 			attribute.String("http.method", "GET"),
-			attribute.String("http.target", "/"),
 			attribute.String("http.scheme", "http"),
 			attribute.String("http.flavor", "1.1"),
 			attribute.String("net.host.name", srvURL.Hostname()),
@@ -208,7 +207,6 @@ func TestHTTPServerRequestFailsGracefully(t *testing.T) {
 	assert.NotPanics(t, func() { got = hc.ServerRequest("", req) })
 	want := []attribute.KeyValue{
 		attribute.String("http.method", "GET"),
-		attribute.String("http.target", ""),
 		attribute.String("http.scheme", "http"),
 		attribute.String("http.flavor", ""),
 		attribute.String("net.host.name", ""),