without this change you have to add a `@Primary` annotation around your custom `TraceFilter` bean to alter the behaviour of the current `TraceFilter` implementation
with this change we're marking the `TraceFilter` as conditional on missing bean; also we're ensuring that the registered `SkipPatternProvider` will be reused when no explicit pattern was set.
also documentation is added
fixes#633
without this change when a CGLIB proxy fails to be created an exception is thrown
with this change we're trying to save the situation by trying to create a JDK proxy. If that also won't work then we're throwing an exception.
fixes#684
without this change if there's a debug flag we set traceid & spanid for the first request inside the zipkin http extractor. we don't set the parent span flag so an additional span is created.
with this change we set the trace and span id ONLY when the debug flag is set AND the request is malformed. That means - only when the span id is set and there is no trace id.
fixes#665
due to this Zuul spans have been improperly closed and the span remained in the main thread. After sending enough requests the traces started to be reused by the worker threads.
fixes#634
according to issue #612:
> When 2 or more customized HystrixConcurrencyStrategy are registered (e.g SleuthHystrixConcurrencyStrategy and SecurityContextConcurrencyStrategy) depending on the order of registration the overrides from SecurityContextConcurrencyStrategy might get ignored.
I think the override and delegation should be made all methods of HystrixConcurrencyStrategy otherwise the delegation will possibly be incomplete.
fixes#612
without this change we allways force Feign to use Hystrix
with this change you need to pass the `feign.hystrix.enabled=true` flag to turn it on
fixes#627
without this change there's no way to alter the exception message that gets attached as a tag to the span
with this change you can register your own ErrorParser bean to alter that behaviour
fixes#576
without this change we're always setting values for headers regardless of the fact whether they have already been set.
with this change we're only setting headers if there was no any previous value of the header
fixes#586
