feat(jaeger-remote-sampler): Implement jaeger remote sampler

experimental/CHANGELOG.md

@@ -24,6 +24,7 @@ All notable changes to experimental packages in this project will be documented
 
 * feat(otlp-transformer): Do not limit @opentelemetry/api upper range peerDependency [#4816](https://github.com/open-telemetry/opentelemetry-js/pull/4816) @mydea
 * feat(instrumentation-http): Allow to opt-out of instrumenting incoming/outgoing requests [#4643](https://github.com/open-telemetry/opentelemetry-js/pull/4643) @mydea
+* feat(sampler-jaeger-remote): added support of jaeger-remote-sampler according to this [spec](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/trace/sdk.md#jaegerremotesampler) [#4534](https://github.com/open-telemetry/opentelemetry-js/pull/4589) @legalimpurity
 
 ### :bug: (Bug Fix)
 

experimental/packages/sampler-jaeger-remote/.eslintignore

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

experimental/packages/sampler-jaeger-remote/.eslintrc.js

@@ -0,0 +1,8 @@
+module.exports = {
+    "env": {
+        "mocha": true,
+        "commonjs": true,
+        "node": true,
+    },
+    ...require('../../../eslint.base.js')
+}

experimental/packages/sampler-jaeger-remote/.npmignore

@@ -0,0 +1,4 @@
+/bin
+/coverage
+/doc
+/test

experimental/packages/sampler-jaeger-remote/LICENSE

@@ -0,0 +1,201 @@
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experimental/packages/sampler-jaeger-remote/README.md

@@ -0,0 +1,66 @@
+# Jaeger Remote Sampler
+
+[![NPM Published Version][npm-img]][npm-url]
+[![Apache License][license-image]][license-image]
+
+**Note: This is an experimental package under active development. Minor releases may include breaking changes.**
+
+The Jaeger Remote Sampler package is designed for OpenTelemetry to dynamically fetch and update sampling strategies from a Jaeger agent or collector. This enables applications to adjust their sampling strategies based on the current configuration provided by Jaeger, optimizing for both performance and observability.
+
+## Installation
+
+```bash
+npm install --save @opentelemetry/sampler-jaeger-remote
+```
+
+## Usage
+
+To integrate the Jaeger Remote Sampler with your application, configure it with the endpoint of your Jaeger agent or collector. The sampler can be set up as follows:
+
+```javascript
+const { JaegerRemoteSampler } = require('@opentelemetry/sampler-jaeger-remote');
+const { Resource } = require('@opentelemetry/resources');
+const { NodeTracerProvider } = require('@opentelemetry/node');
+
+// Jaeger agent endpoint
+const sampler = new JaegerRemoteSampler({
+  endpoint: 'http://your-jaeger-agent:14268/api/sampling',
+  serviceName: 'your-service-name',
+  initialSampler: new AlwaysOnSampler(),
+  poolingInterval: 60000  // 60 seconds
+});
+const provider = new NodeTracerProvider({
+  resource: Resource.default().merge(new Resource({
+    'service.name': 'your-service-name'
+  })),
+  sampler
+});
+
+provider.register();
+```
+
+## Supported Configuration Options
+
+The Jaeger Remote Sampler supports the following sampling strategies based on the configuration received from the remote endpoint:
+
+1. **Per-Operation Sampling**: If the remote configuration includes `operationSampling` with `perOperationStrategies`, it creates a `PerOperationSampler`. This allows for different sampling rates for different operations.
+
+2. **Probabilistic Sampling**: If the remote configuration specifies `StrategyType.PROBABILISTIC`, it creates a `TraceIdRatioBasedSampler`. This samples a percentage of traces based on the trace ID.
+
+3. **Default Sampling**: If none of the above apply, it falls back to the initial sampler provided in the constructor.
+
+## 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/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/sampler-jaeger-remote
+[npm-img]: https://badge.fury.io/js/%40opentelemetry%2Fsampler-jaeger-remote.svg

experimental/packages/sampler-jaeger-remote/package.json

@@ -0,0 +1,69 @@
+{
+  "name": "@opentelemetry/sampler-jaeger-remote",
+  "version": "0.52.1",
+  "description": "Jaeger Remote Sampler",
+  "main": "build/src/index.js",
+  "types": "build/src/index.d.ts",
+  "repository": "open-telemetry/opentelemetry-js",
+  "scripts": {
+    "prepublishOnly": "npm run compile",
+    "compile": "tsc --build",
+    "clean": "tsc --build --clean",
+    "lint": "eslint . --ext .ts",
+    "lint:fix": "eslint . --ext .ts --fix",
+    "tdd": "npm run test -- --watch-extensions ts --watch",
+    "test": "nyc mocha 'test/**/*.test.ts' --exclude 'test/browser/**/*.ts'",
+    "version": "node ../../../scripts/version-update.js",
+    "watch": "tsc -w",
+    "precompile": "cross-var lerna run version --scope $npm_package_name --include-dependencies",
+    "prewatch": "npm run precompile",
+    "peer-api-check": "node ../../../scripts/peer-api-check.js",
+    "align-api-deps": "node ../../../scripts/align-api-deps.js",
+    "codecov": "nyc report --reporter=json && codecov -f coverage/*.json -p ../../../"
+  },
+  "keywords": [
+    "opentelemetry",
+    "nodejs",
+    "metrics",
+    "stats"
+  ],
+  "author": "OpenTelemetry Authors",
+  "license": "Apache-2.0",
+  "engines": {
+    "node": ">=14"
+  },
+  "files": [
+    "build/src/**/*.js",
+    "build/src/**/*.js.map",
+    "build/src/**/*.d.ts",
+    "LICENSE",
+    "README.md"
+  ],
+  "publishConfig": {
+    "access": "public"
+  },
+  "dependencies": {
+    "@opentelemetry/sdk-trace-base": "1.25.1"
+  },
+  "peerDependencies": {
+    "@opentelemetry/api": "^1.3.0"
+  },
+  "devDependencies": {
+    "@types/mocha": "10.0.6",
+    "@types/node": "18.6.5",
+    "@types/sinon": "17.0.3",
+    "codecov": "3.8.3",
+    "cross-var": "1.1.0",
+    "eslint-plugin-header": "^3.1.1",
+    "eslint-plugin-node": "^11.1.0",
+    "eslint-plugin-prettier": "^5.1.3",
+    "lerna": "6.6.2",
+    "mocha": "10.2.0",
+    "nyc": "15.1.0",
+    "sinon": "15.1.2",
+    "ts-loader": "8.4.0",
+    "typescript": "4.4.4"
+  },
+  "homepage": "https://github.com/open-telemetry/opentelemetry-js/tree/main/experimental/packages/sampler-jaeger-remote",
+  "sideEffects": false
+}