open-telemetry · dyladan · Jan 15, 2021 · Jan 7, 2021 · Jan 7, 2021 · Jan 7, 2021
diff --git a/package.json b/package.json
@@ -25,7 +25,9 @@
     "docs": "lerna run docs",
     "docs-deploy": "gh-pages --dist packages/opentelemetry-api/docs/out",
     "lint": "lerna run lint",
+    "lint:changed": "lerna run --concurrency 1 --stream lint --since HEAD --exclude-dependents",
     "lint:fix": "lerna run lint:fix",
+    "lint:fix:changed": "lerna run --concurrency 1 --stream lint:fix --since HEAD --exclude-dependents",
     "lint:examples": "eslint ./examples/**/*.js",
     "lint:examples:fix": "eslint ./examples/**/*.js --fix",
     "lint:markdown": "./node_modules/.bin/markdownlint $(git ls-files '*.md') -i ./CHANGELOG.md",
@@ -63,7 +65,7 @@
   },
   "husky": {
     "hooks": {
-      "pre-commit": "lerna run --concurrency 1 --stream lint --since HEAD --exclude-dependents",
+      "pre-commit": "npm run lint:changed",
       "commit-msg": "commitlint -E HUSKY_GIT_PARAMS"
     }
   }

diff --git a/packages/opentelemetry-api-metrics/.eslintignore b/packages/opentelemetry-api-metrics/.eslintignore
@@ -0,0 +1 @@
+build
diff --git a/packages/opentelemetry-api-metrics/.eslintrc.js b/packages/opentelemetry-api-metrics/.eslintrc.js
@@ -0,0 +1,8 @@
+module.exports = {
+    "env": {
+        "mocha": true,
+        "commonjs": true,
+        "shared-node-browser": true
+    },
+    ...require('../../eslint.config.js')
+}
diff --git a/packages/opentelemetry-api-metrics/LICENSE b/packages/opentelemetry-api-metrics/LICENSE
@@ -0,0 +1,201 @@
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diff --git a/packages/opentelemetry-api-metrics/README.md b/packages/opentelemetry-api-metrics/README.md
@@ -0,0 +1,112 @@
+# OpenTelemetry API for JavaScript
+
+[![Gitter chat][gitter-image]][gitter-url]
+[![NPM Published Version][npm-img]][npm-url]
+[![dependencies][dependencies-image]][dependencies-url]
+[![devDependencies][devDependencies-image]][devDependencies-url]
+[![Apache License][license-image]][license-image]
+
+This package provides everything needed to interact with the unstable OpenTelemetry Metrics API, including all TypeScript interfaces, enums, and no-op implementations. It is intended for use both on the server and in the browser.
+
+## Beta Software - Use at your own risk
+
+The metrics API is considered alpha software and there is no guarantee of stability or long-term support. When the API is stabilized, it will be made available and supported long-term in the `@opentelemetry/api` package and this package will be deprecated.
+
+## Quick Start
+
+To get started you need to install the SDK and instrumentations, create a MeterProvider, and register it with the API.
+
+### Install Dependencies
+
+```sh
+$ # Install metrics dependencies
+$ npm install \
+    @opentelemetry/api-metrics \
+    @opentelemetry/metrics \
+    @opentelemetry/exporter-prometheus # add exporters as needed
+```
+
+> Note: this example is for node.js. See [examples/tracer-web](https://github.com/open-telemetry/opentelemetry-js/tree/master/examples/tracer-web) for a browser example.
+
+### Initialize the SDK
+
+Before any other module in your application is loaded, you must initialize the global tracer and meter providers. If you fail to initialize a provider, no-op implementations will be provided to any library which acquires them from the API.
+
+To collect traces and metrics, you will have to tell the SDK where to export telemetry data to. This example uses Jaeger and Prometheus, but exporters exist for [other tracing backends][other-tracing-backends]. If you're not sure if there is an exporter for your tracing backend, contact your tracing provider.
+
+#### Metrics
+
+```javascript
+const api = require("@opentelemetry/api-metrics");
+const { MeterProvider } = require("@opentelemetry/metrics");
+const { PrometheusExporter } = require("@opentelemetry/exporter-prometheus");
+
+const meterProvider = new MeterProvider({
+  // The Prometheus exporter runs an HTTP server which
+  // the Prometheus backend scrapes to collect metrics.
+  exporter: new PrometheusExporter({ startServer: true }),
+  interval: 1000,
+});
+
+/**
+ * Registering the provider with the API allows it to be discovered
+ * and used by instrumentation libraries.
+ */
+api.metrics.setGlobalMeterProvider(meterProvider);
+```
+
+## Version Compatibility
+
+Because the npm installer and node module resolution algorithm could potentially allow two or more copies of any given package to exist within the same `node_modules` structure, the OpenTelemetry API takes advantage of a variable on the `global` object to store the global API. When an API method in the API package is called, it checks if this `global` API exists and proxies calls to it if and only if it is a compatible API version. This means if a package has a dependency on an OpenTelemetry API version which is not compatible with the API used by the end user, the package will receive a no-op implementation of the API.
+
+## Advanced Use
+
+### API Methods
+
+If you are writing an instrumentation library, or prefer to call the API methods directly rather than using the `register` method on the Tracer/Meter Provider, OpenTelemetry provides direct access to the underlying API methods through the `@opentelemetry/api-metrics` package. API entry points are defined as global singleton objects `trace`, `metrics`, `propagation`, and `context` which contain methods used to initialize SDK implementations and acquire resources from the API.
+
+- [Metrics API Documentation][metrics-api-docs]
+
+```javascript
+const api = require("@opentelemetry/api-metrics");
+
+/* Initialize MeterProvider */
+api.metrics.setGlobalMeterProvider(meterProvider);
+/* returns meterProvider (no-op if a working provider has not been initialized) */
+api.metrics.getMeterProvider();
+/* returns a meter from the registered global meter provider (no-op if a working provider has not been initialized) */
+api.metrics.getMeter(name, version);
+```
+
+## 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 on [gitter][gitter-url]
+
+## License
+
+Apache 2.0 - See [LICENSE][license-url] for more information.
+
+[gitter-image]: https://badges.gitter.im/open-telemetry/opentelemetry-js.svg
+[gitter-url]: https://gitter.im/open-telemetry/opentelemetry-node?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge
+[license-url]: https://github.com/open-telemetry/opentelemetry-js/blob/master/LICENSE
+[license-image]: https://img.shields.io/badge/license-Apache_2.0-green.svg?style=flat
+[dependencies-image]: https://david-dm.org/open-telemetry/opentelemetry-js/status.svg?path=packages/opentelemetry-api
+[dependencies-url]: https://david-dm.org/open-telemetry/opentelemetry-js?path=packages%2Fopentelemetry-api
+[devDependencies-image]: https://david-dm.org/open-telemetry/opentelemetry-js/dev-status.svg?path=packages/opentelemetry-api
+[devDependencies-url]: https://david-dm.org/open-telemetry/opentelemetry-js?path=packages%2Fopentelemetry-api&type=dev
+[npm-url]: https://www.npmjs.com/package/@opentelemetry/api-metrics
+[npm-img]: https://badge.fury.io/js/%40opentelemetry%2Fapi.svg
+
+[trace-api-docs]: https://open-telemetry.github.io/opentelemetry-js/classes/traceapi.html
+[metrics-api-docs]: https://open-telemetry.github.io/opentelemetry-js/classes/metricsapi.html
+[propagation-api-docs]: https://open-telemetry.github.io/opentelemetry-js/classes/propagationapi.html
+[context-api-docs]: https://open-telemetry.github.io/opentelemetry-js/classes/contextapi.html
+
+[web]: https://github.com/open-telemetry/opentelemetry-js/tree/master/packages/opentelemetry-web
+[tracing]: https://github.com/open-telemetry/opentelemetry-js/tree/master/packages/opentelemetry-tracing
+[node]: https://github.com/open-telemetry/opentelemetry-js/tree/master/packages/opentelemetry-node
+[metrics]: https://github.com/open-telemetry/opentelemetry-js/tree/master/packages/opentelemetry-metrics
+
+[other-tracing-backends]: https://github.com/open-telemetry/opentelemetry-js#trace-exporters
diff --git a/packages/opentelemetry-api-metrics/karma.conf.js b/packages/opentelemetry-api-metrics/karma.conf.js
@@ -0,0 +1,24 @@
+/*!
+ * Copyright The OpenTelemetry Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+const karmaWebpackConfig = require('../../karma.webpack');
+const karmaBaseConfig = require('../../karma.base');
+
+module.exports = (config) => {
+  config.set(Object.assign({}, karmaBaseConfig, {
+    webpack: karmaWebpackConfig
+  }))
+};