feat: Add new baggage span processor package

.github/component_owners.yml

@@ -27,6 +27,9 @@ components:
     - pichlermarc
     - legendecas
     - blumamir
+  packages/baggage-span-processor:
+    - mikegoldsmith
+    - jamiedanielson
   packages/opentelemetry-host-metrics:
     - legendecas
   packages/opentelemetry-id-generator-aws-xray:

.release-please-manifest.json

@@ -8,6 +8,7 @@
   "detectors/node/opentelemetry-resource-detector-instana": "0.8.0",
   "metapackages/auto-instrumentations-node": "0.44.0",
   "metapackages/auto-instrumentations-web": "0.38.0",
+  "packages/baggage-span-processor": "0.1.0",
   "packages/opentelemetry-host-metrics": "0.35.0",
   "packages/opentelemetry-id-generator-aws-xray": "1.2.1",
   "packages/opentelemetry-propagation-utils": "0.30.8",

packages/baggage-span-processor/.eslintignore

@@ -0,0 +1 @@
+build

packages/baggage-span-processor/.eslintrc.js

@@ -0,0 +1,7 @@
+module.exports = {
+    "env": {
+        "mocha": true,
+        "node": true
+    },
+    ...require('../../eslint.config.js')
+}

packages/baggage-span-processor/CHANGELOG.md

@@ -0,0 +1,5 @@
+# Changelog
+
+## 0.1.0
+
+Initial version.

packages/baggage-span-processor/LICENSE

@@ -0,0 +1,201 @@
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packages/baggage-span-processor/README.md

@@ -0,0 +1,63 @@
+# OpenTelemetry Baggage Span Processor for Node.js
+
+[![NPM Published Version][npm-img]][npm-url]
+[![Apache License][license-image]][license-url]
+
+The BaggageSpanProcessor reads entries stored in Baggage from the parent context and adds the [baggage](https://opentelemetry.io/docs/concepts/signals/baggage) entries' keys and
+values to the span as attributes on span start.
+
+Add this span processor to a tracer provider.
+
+Keys and values added to Baggage will appear on subsequent child spans for a trace within this service *and* be propagated to external services in accordance with any configured propagation formats configured.
+If the external services also have a Baggage span processor, the keys and values will appear in those child spans as well.
+
+⚠ Warning ⚠️
+
+Do not put sensitive information in Baggage.
+
+To repeat: a consequence of adding data to Baggage is that the keys and values will appear in all outgoing HTTP headers from the application.
+
+Compatible with OpenTelemetry JS API and SDK `1.0+`.
+
+## Installation
+
+```bash
+npm install --save @opentelemetry/baggage-span-processor
+```
+
+### Usage
+
+Add to the span processors during configuration:
+
+```javascript
+import { NodeSDK, tracing } from "@opentelemetry/sdk-node";
+import { BaggageSpanProcessor } from "@opentelemetry/baggage-span-processor";
+
+const spanProcessors = [
+  new tracing.SimpleSpanProcessor(
+    new tracing.ConsoleSpanExporter()),
+  new BaggageSpanProcessor()];
+
+const sdk = new NodeSDK({
+  serviceName: "example-service",
+  spanProcessors
+});
+
+sdk.start();
+```
+
+## Useful links
+
+* For more information on OpenTelemetry, visit: <https://opentelemetry.io/>
+* For more about OpenTelemetry JavaScript: <https://github.com/open-telemetry/opentelemetry-js>
+* For help or feedback on this project, join us in [GitHub Discussions][discussions-url]
+
+## License
+
+APACHE 2.0 - See [LICENSE][license-url] for more information.
+
+[discussions-url]: https://github.com/open-telemetry/opentelemetry-js/discussions
+[license-url]: https://github.com/open-telemetry/opentelemetry-js-contrib/blob/main/LICENSE
+[license-image]: https://img.shields.io/badge/license-Apache_2.0-green.svg?style=flat
+[npm-url]: https://www.npmjs.com/package/@opentelemetry/host-metrics
+[npm-img]: https://badge.fury.io/js/%40opentelemetry%2Fhost-metrics.svg