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Abstract tracer implementations via an API (#1757)
Spring Cloud Sleuth currently is an autoconfiguration over Brave. It also consists of various instrumentation mechanisms for libraries that are not supported by Brave (e.g. Spring Cloud Circuitbreaker).

We would like to abstract Brave so that Spring Cloud Sleuth becomes an autoconfiguration for any tracer implementation that is compatible with Spring Cloud Sleuth. That way Spring Cloud Sleuth in its core module would consist of an API and various tracer implementations would implement that API which would also allow automatic instrumentation of libraries that are supported by Spring Cloud Sleuth.

## OpenTelemetry Support

Thanks to doing this abstraction we are able to support new tracer implementations, not only Brave. We've decided to add support for the OpenTelemetry SDK as the second one. If in the future if we decide to add new tracers then it will be just a matter of adding a new module that bridges to the Spring Cloud Sleuth one. Thanks to abstraction of tests as well we will be easily able to plug that tracer mechanism into our current suite of tests.
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marcingrzejszczak committed Oct 23, 2020
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