Expose isSampled() in TraceContext

[phxql]

Is your feature request related to a problem? Please describe.
I'm trying to log a JSON field "sampled": true when the current trace is sampled.

Describe the solution you'd like
It would be great if org.springframework.cloud.sleuth.TraceContext could expose the isSampled() Method found in BraveTraceContext.

Describe alternatives you've considered
Im 3.0.0-M5 i casted the TraceContext to BraveTraceContext but this is no longer possible, as BraveTraceContext is now package protected.

[marcingrzejszczak]

Makes perfect sense!

[phxql]

Just a quick note: in your commit d547386 you used a boolean, the isSampled() from Brave returns a Boolean (nullable) - this could lead to a NPE.

[marcingrzejszczak]

Oh, great catch! Let me fix this

[marcingrzejszczak]

There you go 7fee267

[marcingrzejszczak]

I've renamed the method to sampled from isSampled to be consistent with lack of get / set / is

[phxql]

Perfect, many thanks!