chore: add logging example

[lyl156]

It is PR for issue#2238.

[linux-foundation-easycla]

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[lyl156]

CI is not clear now.

Should I pull this and re-submit again?
Or is there something I can do to clear the CI?

[hanyuancheung]

CI is not clear now.

Should I pull this and re-submit again? Or is there something I can do to clear the CI?

rerun make precommit command before committing the code.

[lyl156]

CI is not clear now.
Should I pull this and re-submit again? Or is there something I can do to clear the CI?

rerun make precommit command before committing the code.

I pull origin and make precommit.
However, the process fails at test/./exporters/jaeger every time. I am confused why this error occurs, because I didn't modify test/./exporters/jaeger.

FAIL    go.opentelemetry.io/otel/exporters/jaeger       0.325s
?       go.opentelemetry.io/otel/exporters/jaeger/internal/gen-go/agent [no test files]
?       go.opentelemetry.io/otel/exporters/jaeger/internal/gen-go/agent/agent-remote    [no test files]
?       go.opentelemetry.io/otel/exporters/jaeger/internal/gen-go/jaeger        [no test files]
?       go.opentelemetry.io/otel/exporters/jaeger/internal/gen-go/jaeger/collector-remote       [no test files]
?       go.opentelemetry.io/otel/exporters/jaeger/internal/gen-go/zipkincore    [no test files]
?       go.opentelemetry.io/otel/exporters/jaeger/internal/gen-go/zipkincore/zipkin_collector-remote    [no test files]
FAIL
make: *** [test/./exporters/jaeger] Error 1

[MrAlias]

This PR adds an example of how to use the logging exporter for the collector. The linked issue this PR says it addresses is one that looks to refactor the existing collector example, not add another one with a different exporter. I do not see the value in accepting these changes, it does not add a unique example of how to use this project. I would recommend it is closed.

[lyl156]

This PR adds an example of how to use the logging exporter for the collector. The linked issue this PR says it addresses is one that looks to refactor the existing collector example, not add another one with a different exporter. I do not see the value in accepting these changes, it does not add a unique example of how to use this project. I would recommend it is closed.

The value of this is PR is to provide an example which keep the scope to just export OTLP to a collector running locally (via Docker).
This is also what was requested in the original issue.

Using this example does not require jaeger, prometheus and any other third-party backends, nor does it require users to use k8s to locally establish a cluster.

Using this example, you can clearly see the original trace data provided by open-telemetry, not through any other backend that developers might lose the original view of trace data. You can also use this example to understand the easiest way to generate trace data.

I keep the original example instead of refactoring it. Because the user can make enhanced observation of the trace data through other backends after using this example.

[dmathieu]

I think naming this example logger is misleading. It may look like the example is about using the library to do logging.
I also agree with @MrAlias that we don't need a new example if one is too complicated. The existing example should be simplified, or refactored to be more understandable (for example with steps of increasing complexity).

[MrAlias]

I think naming this example logger is misleading. It may look like the example is about using the library to do logging. I also agree with @MrAlias that we don't need a new example if one is too complicated. The existing example should be simplified, or refactored to be more understandable (for example with steps of increasing complexity).

@lyl156 is this something you are willing to consider?

[lyl156]

What I can do now is to replace the original with mine, because I don't understand your exact thoughts on this issue.
If you can provide exact examples representing the result you want, I'd love to revise this pr.
If not, I will close this pr soon.