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# OpenTelemetry Logs SDK

[![NPM Published Version][npm-img]][npm-url]
[![Apache License][license-image]][license-image]

**Note: This is an experimental package under active development. New releases may include breaking changes.**

OpenTelemetry logs module contains the foundation for all logs SDKs of [opentelemetry-js](https://github.com/open-telemetry/opentelemetry-js).

Used standalone, this module provides methods for manual instrumentation of code, offering full control over recording logs for client-side JavaScript (browser) and Node.js.

It does **not** provide automated instrumentation of known libraries or host environment logs out-of-the-box.

## Installation

```bash
npm install --save @opentelemetry/api-logs
npm install --save @opentelemetry/sdk-logs
```

## Usage

The basic setup of the SDK can be seen as followings:

```js
const logsAPI = require('@opentelemetry/api-logs');
const {
  LoggerProvider,
  SimpleLogRecordProcessor,
  ConsoleLogRecordExporter,
} = require('@opentelemetry/sdk-logs');

// To start a logger, you first need to initialize the Logger provider.
const loggerProvider = new LoggerProvider();
// Add a processor to export log record
loggerProvider.addLogRecordProcessor(
  new SimpleLogRecordProcessor(new ConsoleLogRecordExporter())
);

//  To create a log record, you first need to get a Logger instance
const logger = loggerProvider.getLogger('default');

// You can also use global singleton
logsAPI.logs.setGlobalLoggerProvider(loggerProvider);
const logger = logsAPI.logs.getLogger('default');

// emit a log record
logger.emit({
  severityNumber: logsAPI.SeverityNumber.INFO,
  severityText: 'INFO',
  body: 'this is a log record body',
  attributes: { 'log.type': 'LogRecord' },
});
```

## Config

Logs configuration is a merge of both the user supplied configuration and the default
configuration as specified in [config.ts](./src/config.ts)

## Example

See [examples/logs](https://github.com/open-telemetry/opentelemetry-js/tree/main/experimental/examples/logs)

## 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/sdk-logs
[npm-img]: https://badge.fury.io/js/%40opentelemetry%2Fsdk%2Dlogs.svg