595aea1 more query options + view options [كارل مبارك]
# OpenTelemetry Core
[![NPM Published Version][npm-img]][npm-url]
[![Apache License][license-image]][license-image]
This package provides default implementations of the OpenTelemetry API for trace and metrics. It's intended for use both on the server and in the browser.
## Built-in Implementations
- [OpenTelemetry Core](#opentelemetry-core)
- [Built-in Implementations](#built-in-implementations)
- [Built-in Propagators](#built-in-propagators)
- [W3CTraceContextPropagator Propagator](#w3ctracecontextpropagator-propagator)
- [Composite Propagator](#composite-propagator)
- [Baggage Propagator](#baggage-propagator)
- [Useful links](#useful-links)
- [License](#license)
### Built-in Propagators
#### W3CTraceContextPropagator Propagator
OpenTelemetry provides a text-based approach to propagate context to remote services using the [W3C Trace Context](https://www.w3.org/TR/trace-context/) HTTP headers.
```js
const api = require("@opentelemetry/api");
const { W3CTraceContextPropagator } = require("@opentelemetry/core");
/* Set Global Propagator */
api.propagation.setGlobalPropagator(new W3CTraceContextPropagator());
```
#### Composite Propagator
Combines multiple propagators into a single propagator.
> This is used as a default Propagator
```js
const api = require("@opentelemetry/api");
const { CompositePropagator } = require("@opentelemetry/core");
/* Set Global Propagator */
api.propagation.setGlobalPropagator(new CompositePropagator());
```
#### Baggage Propagator
Provides a text-based approach to propagate [baggage](https://w3c.github.io/baggage/) to remote services using the [OpenTelemetry Baggage Propagation](https://github.com/open-telemetry/opentelemetry-specification/blob/master/specification/baggage/api.md#baggage-propagation) HTTP headers.
```js
const api = require("@opentelemetry/api");
const { W3CBaggagePropagator } = require("@opentelemetry/core");
/* Set Global Propagator */
api.propagation.setGlobalPropagator(new W3CBaggagePropagator());
```
## 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/core
[npm-img]: https://badge.fury.io/js/%40opentelemetry%2Fcore.svg