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3362421c9b
This is to shrink the PR #100. The only place where the registry.Variable type was used was metrics, so just inline that type into its only user. The use of the registry.Variable type in core.Key was limited to the Name field. The stats package also used the registry.Variable type, but seems that also only the Name field was used and the package is going to be dropped anyway.
OpenTelemetry-Go
This is a prototype intended to be modified into the opentelemetry-go implementation. The api directory here should be used as a starting point to introduce a new OpenTelemetry exporter, whereas the existing exporter/observer streaming model should be help verify the api
To run the examples, first build the stderr tracer plugin (requires Linux or OS X):
(cd ./experimental/streaming/exporter/stdout/plugin && make)
(cd ./experimental/streaming/exporter/spanlog/plugin && make)
Then set the OPENTELEMETRY_LIB environment variable to the .so file in that directory, e.g.,
OPENTELEMETRY_LIB=./experimental/streaming/exporter/stderr/plugin/stderr.so go run ./example/http/server/server.go
and
OPENTELEMETRY_LIB=./experimental/streaming/exporter/spanlog/plugin/spanlog.so go run ./example/http/client/client.go