open-telemetry · pichlermarc · Dec 3, 2025 · Dec 3, 2025
@@ -41,18 +41,28 @@ registerInstrumentations({
 
 ## Semantic Conventions
 
-This package uses `@opentelemetry/semantic-conventions` version `1.22+`, which implements Semantic Convention [Version 1.7.0](https://github.com/open-telemetry/opentelemetry-specification/blob/v1.7.0/semantic_conventions/README.md)
-
-Attributes added to `connect` spans:
-
-| Attribute                 | Short Description                                                        |
-| ------------------------- | ------------------------------------------------------------------------ |
-| `net.transport`           | `IP.TCP`, `pipe` or `Unix`                                               |
-| `net.peer.name`           | Host name or the IPC file path                                           |
-| `net.peer.ip` (for TCP)   | Remote address of the peer (dotted decimal for IPv4 or RFC5952 for IPv6) |
-| `net.peer.port` (for TCP) | Remote port number                                                       |
-| `net.host.ip` (for TCP)   | Like net.peer.ip but for the host IP. Useful in case of a multi-IP host  |
-| `net.host.port` (for TCP) | Like net.peer.port but for the host port                                 |
+This instrumentation implements Semantic Conventions (semconv) v1.7.0. Since then, many networking-related semantic conventions (in semconv v1.21.0 and v1.23.1) were stabilized. As of `@opentelemetry/[email protected]` support has been added for migrating to the stable semantic conventions using the `OTEL_SEMCONV_STABILITY_OPT_IN` environment variable as follows:
+
+1. Upgrade to the latest version of this instrumentation package.
+2. Set `OTEL_SEMCONV_STABILITY_OPT_IN=http/dup` to emit both old and stable semantic conventions. (The [`http` token is used to control the `net.*` attributes](https://github.com/open-telemetry/opentelemetry-js/issues/5663#issuecomment-3349204546).)
+3. Modify alerts, dashboards, metrics, and other processes in your Observability system to use the stable semantic conventions.
+4. Set `OTEL_SEMCONV_STABILITY_OPT_IN=http` to emit only the stable semantic conventions.
+
+By default, if `OTEL_SEMCONV_STABILITY_OPT_IN` is not set or does not include `http`, then the old v1.7.0 semconv is used.
+The intent is to provide an approximate 6 month time window for users of this instrumentation to migrate to the new networking semconv, after which a new minor version will use the new semconv by default and drop support for the old semconv.
+See [the HTTP migration guide](https://opentelemetry.io/docs/specs/semconv/non-normative/http-migration/) and [deprecated network attributes](https://opentelemetry.io/docs/specs/semconv/registry/attributes/network/#deprecated-network-attributes) for details.
+
+Attributes collected:
+
+| Old semconv     | Stable semconv          | Description                                                                       |
+| --------------- | ----------------------- | --------------------------------------------------------------------------------- |
+| `net.transport` | `network.transport`     | One of `pipe`, `unix`, `ip_tcp` (old) or `tcp` (stable)                           |
+| `net.peer.name` | `server.address`        | Host name or the IPC file path                                                    |
+| `net.peer.port` | `server.port`           | Remote port number                                                                |
+| `net.peer.ip`   | `network.peer.address`  | Peer address of the network connection - IP address or Unix domain socket name.   |
+| `net.host.ip`   | `network.local.address` | Local address of the network connection - IP address or Unix domain socket name.  |
+| `net.host.port` | `network.local.port`    | Local port number of the network connection.                                      |
+
 
 ## Useful links
 

@@ -51,7 +51,8 @@
     "@opentelemetry/sdk-trace-node": "^2.0.0"
   },
   "dependencies": {
-    "@opentelemetry/instrumentation": "^0.208.0"
+    "@opentelemetry/instrumentation": "^0.208.0",
+    "@opentelemetry/semantic-conventions": "^1.33.0"
   },
   "homepage": "https://github.com/open-telemetry/opentelemetry-js-contrib/tree/main/packages/instrumentation-net#readme"
 }
@@ -14,14 +14,25 @@
  * limitations under the License.
  */
 
-import { Span, SpanStatusCode, context, trace } from '@opentelemetry/api';
+import { Span, SpanStatusCode, context, trace, type Attributes } from '@opentelemetry/api';
 import {
   InstrumentationBase,
   InstrumentationConfig,
   InstrumentationNodeModuleDefinition,
   isWrapped,
   safeExecuteInTheMiddle,
+  SemconvStability,
+  semconvStabilityFromStr,
 } from '@opentelemetry/instrumentation';
+import {
+  ATTR_NETWORK_LOCAL_ADDRESS,
+  ATTR_NETWORK_LOCAL_PORT,
+  ATTR_NETWORK_PEER_ADDRESS,
+  ATTR_NETWORK_TRANSPORT,
+  ATTR_SERVER_ADDRESS,
+  ATTR_SERVER_PORT,
+  NETWORK_TRANSPORT_VALUE_TCP,
+} from '@opentelemetry/semantic-conventions';
 import {
   ATTR_NET_HOST_IP,
   ATTR_NET_HOST_PORT,
@@ -33,16 +44,27 @@ import {
 } from './semconv';
 import { TLSAttributes } from './types';
 import { NormalizedOptions, SocketEvent } from './internal-types';
-import { getNormalizedArgs, IPC_TRANSPORT } from './utils';
+import { getNormalizedArgs, OLD_IPC_TRANSPORT_VALUE, STABLE_IPC_TRANSPORT_VALUE } from './utils';
 /** @knipignore */
 import { PACKAGE_NAME, PACKAGE_VERSION } from './version';
 import { Socket } from 'net';
 import { TLSSocket } from 'tls';
 import type * as net from 'net';
 
 export class NetInstrumentation extends InstrumentationBase {
+  private _netSemconvStability!: SemconvStability;
+
   constructor(config: InstrumentationConfig = {}) {
     super(PACKAGE_NAME, PACKAGE_VERSION, config);
+    this._setSemconvStabilityFromEnv();
+  }
+
+  // Used for testing.
+  private _setSemconvStabilityFromEnv() {
+    this._netSemconvStability = semconvStabilityFromStr(
+      'http',
+      process.env.OTEL_SEMCONV_STABILITY_OPT_IN
+    );
   }
 
   init(): InstrumentationNodeModuleDefinition[] {
@@ -182,34 +204,43 @@ export class NetInstrumentation extends InstrumentationBase {
   private _startGenericSpan(socket: Socket) {
     const span = this.tracer.startSpan('connect');
 
-    registerListeners(socket, span);
+    registerListeners(socket, span, false, this._netSemconvStability);
 
     return span;
   }
 
   private _startIpcSpan(options: NormalizedOptions, socket: Socket) {
-    const span = this.tracer.startSpan('ipc.connect', {
-      attributes: {
-        [ATTR_NET_TRANSPORT]: IPC_TRANSPORT,
-        [ATTR_NET_PEER_NAME]: options.path,
-      },
-    });
+    const attributes: Attributes = {};
+    if (this._netSemconvStability & SemconvStability.OLD) {
+      attributes[ATTR_NET_TRANSPORT] = OLD_IPC_TRANSPORT_VALUE;
+      attributes[ATTR_NET_PEER_NAME] = options.path;
+    }
+    if (this._netSemconvStability & SemconvStability.STABLE) {
+      attributes[ATTR_NETWORK_TRANSPORT] = STABLE_IPC_TRANSPORT_VALUE;
+      attributes[ATTR_SERVER_ADDRESS] = options.path;
+    }
+    const span = this.tracer.startSpan('ipc.connect', { attributes });
 
-    registerListeners(socket, span);
+    registerListeners(socket, span, false, this._netSemconvStability);
 
     return span;
   }
 
   private _startTcpSpan(options: NormalizedOptions, socket: Socket) {
-    const span = this.tracer.startSpan('tcp.connect', {
-      attributes: {
-        [ATTR_NET_TRANSPORT]: NET_TRANSPORT_VALUE_IP_TCP,
-        [ATTR_NET_PEER_NAME]: options.host,
-        [ATTR_NET_PEER_PORT]: options.port,
-      },
-    });
+    const attributes: Attributes = {};
+    if (this._netSemconvStability & SemconvStability.OLD) {
+      attributes[ATTR_NET_TRANSPORT] = NET_TRANSPORT_VALUE_IP_TCP;
+      attributes[ATTR_NET_PEER_NAME] = options.host;
+      attributes[ATTR_NET_PEER_PORT] = options.port;
+    }
+    if (this._netSemconvStability & SemconvStability.STABLE) {
+      attributes[ATTR_NETWORK_TRANSPORT] = NETWORK_TRANSPORT_VALUE_TCP;
+      attributes[ATTR_SERVER_ADDRESS] = options.host;
+      attributes[ATTR_SERVER_PORT] = options.port;
+    }
+    const span = this.tracer.startSpan('tcp.connect', { attributes });
 
-    registerListeners(socket, span, { hostAttributes: true });
+    registerListeners(socket, span, true, this._netSemconvStability);
 
     return span;
   }
@@ -239,17 +270,25 @@ function spanErrorHandler(span: Span) {
 function registerListeners(
   socket: Socket,
   span: Span,
-  { hostAttributes = false }: { hostAttributes?: boolean } = {}
+  hostAttributes: boolean,
+  netSemconvStability: SemconvStability,
 ) {
   const setSpanError = spanErrorHandler(span);
   const setSpanEnd = spanEndHandler(span);
 
   const setHostAttributes = () => {
-    span.setAttributes({
-      [ATTR_NET_PEER_IP]: socket.remoteAddress,
-      [ATTR_NET_HOST_IP]: socket.localAddress,
-      [ATTR_NET_HOST_PORT]: socket.localPort,
-    });
+    const attributes: Attributes = {};
+    if (netSemconvStability & SemconvStability.OLD) {
+      attributes[ATTR_NET_PEER_IP] = socket.remoteAddress;
+      attributes[ATTR_NET_HOST_IP] = socket.localAddress;
+      attributes[ATTR_NET_HOST_PORT] = socket.localPort;
+    }
+    if (netSemconvStability & SemconvStability.STABLE) {
+      attributes[ATTR_NETWORK_PEER_ADDRESS] = socket.remoteAddress;
+      attributes[ATTR_NETWORK_LOCAL_ADDRESS] = socket.localAddress;
+      attributes[ATTR_NETWORK_LOCAL_PORT] = socket.localPort;
+    }
+    span.setAttributes(attributes);
   };
 
   socket.once(SocketEvent.ERROR, setSpanError);

@@ -14,21 +14,21 @@
  * limitations under the License.
  */
 
+import { platform } from 'os';
+import {
+  NETWORK_TRANSPORT_VALUE_PIPE,
+  NETWORK_TRANSPORT_VALUE_UNIX,
+} from '@opentelemetry/semantic-conventions';
 import { NormalizedOptions } from './internal-types';
 import { NET_TRANSPORT_VALUE_PIPE } from './semconv';
-import { platform } from 'os';
 
-// Currently the `IPC_TRANSPORT` values are for 'net.transport'. In semconv
-// v1.21.0 a breaking change (https://github.com/open-telemetry/opentelemetry-specification/pull/3426)
-// replaced 'net.transport' with 'network.transport'. The deprecated
-// 'net.transport' *removed* the 'unix' value (not sure if intentional). As a
-// result, the JS `@opentelemetry/semantic-conventions` package does not export
-// a `NET_TRANSPORT_VALUE_UNIX`.
-//
-// (TODO: update instrumentation-net (per PR-3426) to use 'network.transport',
-// then the `NETWORK_TRANSPORT_VALUE_UNIX` constant can be used.)
-export const IPC_TRANSPORT =
+// There is no `NET_TRANSPORT_VALUE_UNIX` because breaking change
+// https://github.com/open-telemetry/opentelemetry-specification/pull/3426
+// *removed* it. This was from before semconv got more careful of removals.
+export const OLD_IPC_TRANSPORT_VALUE =
   platform() === 'win32' ? NET_TRANSPORT_VALUE_PIPE : 'unix';
+export const STABLE_IPC_TRANSPORT_VALUE =
+  platform() === 'win32' ? NETWORK_TRANSPORT_VALUE_PIPE : NETWORK_TRANSPORT_VALUE_UNIX;
 
 function getHost(args: unknown[]) {
   return typeof args[1] === 'string' ? args[1] : 'localhost';