RuntimeError: Requested component 'jaeger' not found in entry points for 'opentelemetry_exporter'

[srikanthccv]

From the exporters selection of spec

Known values for OTEL_TRACES_EXPORTER are:

• "otlp": OTLP
• "jaeger": Jaeger gRPC
• "zipkin": Zipkin (Defaults to protobuf format)
• "none": No automatically configured exporter for traces.

We have split up the exporters based on protocol + serialisation to avoid taking unnecessary dependency so there is no entry point for jaeger. If someone reads the spec and follows that recommendation they will run into this error. We should either add an entry point jaeger or an alias that solves this problem.

[owais]

Adding an alias could result in unexpected and hard to debug behavior as someone might expect gRPC and we enable thrift or vice-versa. I think we should do the following:

1. Update documentation to note actual exporter names (jaeger-thrift, jaeger-grpc, etc)
2. Handle cases like jaeger but crash early with a helpful error messaging guiding the user towards "jaeger-thrift", "jaeger-grpc" and may be a link to docs.

[srikanthccv]

What do you think about something like this? Update the glue package entry point with exporter default protocol recommended by spec.

diff --git exporter/opentelemetry-exporter-jaeger/setup.cfg exporter/opentelemetry-exporter-jaeger/setup.cfg
index b01b3a8d..7075ea14 100644
--- exporter/opentelemetry-exporter-jaeger/setup.cfg
+++ exporter/opentelemetry-exporter-jaeger/setup.cfg
@@ -44,3 +44,7 @@ install_requires =

 [options.extras_require]
 test =
+
+[options.entry_points]
+opentelemetry_exporter =
+    jaeger = opentelemetry.exporter.jaeger.proto.grpc:JaegerExporter
diff --git exporter/opentelemetry-exporter-zipkin/setup.cfg exporter/opentelemetry-exporter-zipkin/setup.cfg
index 6d2f9740..d3641e48 100644
--- exporter/opentelemetry-exporter-zipkin/setup.cfg
+++ exporter/opentelemetry-exporter-zipkin/setup.cfg
@@ -43,3 +43,7 @@ install_requires =

 [options.extras_require]
 test =
+
+[options.entry_points]
+opentelemetry_exporter =
+    zipkin = opentelemetry.exporter.zipkin.proto.http:ZipkinExporter

[owais]

If there are defaults for jaeger,zipkin and otlp recommended by the spec then we should use them for sure.