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Add documentation guidelines and improve Jaeger exporter readme (#2082)

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* Add documentation guidelines and improve Jaeger exporter readme

* Improve docs

* Update CONTRIBUTING.md
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CONTRIBUTING.md
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@ -113,6 +113,7 @@ A PR is considered to be **ready to merge** when:
one day and may be merged with a single Maintainer's approval.
* `CHANGELOG.md` has been updated to reflect what has been
added, changed, removed, or fixed.
* `README.md` has been updated if necessary.
* Urgent fix can take exception as long as it has been actively
communicated.
@ -143,6 +144,26 @@ patterns in the spec.
For a deeper discussion, see
[this](https://github.com/open-telemetry/opentelemetry-specification/issues/165).
## Documentation
Each non-example Go Module should have its own `README.md` containing:
- A pkg.go.dev badge which can be generated [here](https://pkg.go.dev/badge/).
- Brief description.
- Installation instructions (and requirements if applicable).
- Hyperlink to an example. Depending on the component the example can be:
- An `example_test.go` like [here](exporters/stdout/stdouttrace/example_test.go).
- A sample Go application with its own `README.md`, like [here](example/zipkin).
- Additional documentation sections such us:
- Configuration,
- Contributing,
- References.
[Here](exporters/jaeger/README.md) is an example of a concise `README.md`.
Moreover, it should be possible to navigate to any `README.md` from the
root `README.md`.
## Style Guide
One of the primary goals of this project is that it is actually used by

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exporters/jaeger/README.md
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@ -1,6 +1,8 @@
# OpenTelemetry-Go Jaeger Exporter
OpenTelemetry Jaeger exporter
[![Go Reference](https://pkg.go.dev/badge/go.opentelemetry.io/otel/exporters/jaeger.svg)](https://pkg.go.dev/go.opentelemetry.io/otel/exporters/jaeger)
[OpenTelemetry span exporter for Jaeger](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/trace/sdk_exporters/jaeger.md) implementation.
## Installation
@ -8,6 +10,41 @@ OpenTelemetry Jaeger exporter
go get -u go.opentelemetry.io/otel/exporters/jaeger
```
## Maintenance
## Example
This exporter uses a vendored copy of the Apache Thrift library (v0.14.1) at a custom import path. When re-generating Thrift code in future, please adapt import paths as necessary.
See [../../example/jaeger](../../example/jaeger).
## Configuration
The exporter can be used to send spans to:
- Jaeger agent using `jaeger.thrift` over binary thrift protocol via
[`WithAgentEndpoint`](https://pkg.go.dev/go.opentelemetry.io/otel/exporters/jaeger#WithAgentEndpoint) option.
- Jaeger collector using `jaeger.thrift` over HTTP via
[`WithCollectorEndpoint`](https://pkg.go.dev/go.opentelemetry.io/otel/exporters/jaeger#WithCollectorEndpoint) option.
### Environment Variables
The following environment variables can be used
(instead of options objects) to override the default configuration.
| Environment variable | Option | Default value |
| --------------------------------- | --------------------------------------------------------------------------------------------- | ----------------------------------- |
| `OTEL_EXPORTER_JAEGER_AGENT_HOST` | [`WithAgentHost`](https://pkg.go.dev/go.opentelemetry.io/otel/exporters/jaeger#WithAgentHost) | `localhost` |
| `OTEL_EXPORTER_JAEGER_AGENT_PORT` | [`WithAgentPort`](https://pkg.go.dev/go.opentelemetry.io/otel/exporters/jaeger#WithAgentPort) | |
| `OTEL_EXPORTER_JAEGER_ENDPOINT` | [`WithEndpoint`](https://pkg.go.dev/go.opentelemetry.io/otel/exporters/jaeger#WithEndpoint) | `http://localhost:14268/api/traces` |
| `OTEL_EXPORTER_JAEGER_USER` | [`WithUsername`](https://pkg.go.dev/go.opentelemetry.io/otel/exporters/jaeger#WithUsername) | |
| `OTEL_EXPORTER_JAEGER_PASSWORD` | [`WithPassword`](https://pkg.go.dev/go.opentelemetry.io/otel/exporters/jaeger#WithPassword) | |
Configuration using options have precedence over the environment variables.
## Contributing
This exporter uses a vendored copy of the Apache Thrift library (v0.14.1) at a custom import path.
When re-generating Thrift code in the future, please adapt import paths as necessary.
## References
- [Jaeger](https://www.jaegertracing.io/)
- [OpenTelemetry to Jaeger Transformation](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/trace/sdk_exporters/jaeger.md)
- [OpenTelemetry Environment Variable Specification](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/sdk-environment-variables.md)