Update to OpenTelemetry 0.10.0

[HaloFour]

Updates to using OpenTelemetry 0.10.0 libraries.

Summary of major changes:

1. Packages renamed from io.opentelemetry.trace._ to io.opentelemetry.api.trace._
2. StatusCanonicalCode renamed to StatusCode
3. Many methods on Span to add attributes, events, etc., changed to return the instance of the Span instead of void/Unit
   • Because of this I updated the Money Span interface to override all of these members and use covariant returns so that they return a Money Span instead of the OpenTelemetry Span.
4. TextMapPropagator.Getter[T] now has two required members and is no longer valid as a functional interface in Java or as a SAM in Scala.
   • The second member is keys() which returns an Iterable[String] of header names. This forces the Formatter#fromHttpHeaders method to also be changed to accept an Iterable[String] of the header names.
5. io.grpc.Context has been replaced with io.opentelemetry.context.Context
6. Context APIs have been removed, e.g. Tracer#withSpan, TracingContextUtils
7. Context APIs have been moved to Context, e.g. Context.with(span).makeCurrent()
   • Because of this there is no longer an API path to intercept when the current span is changed, so an SPI provider for ContextStorage is used to replace the underlying storage mechanism which can intercept when contexts are changed which detects the span in those contexts and updates MDC accordingly.

[HaloFour]

The biggest change is to how span thread context is managed. The GRPC Context has been replaced with a built-in implementation and the static helper class has been replaced with a combination of static and instance methods. The trickiest aspect is that putting a span into the context involves calling an instance method on Span, which doesn't really work when Span is mocked.

The rest is mostly superficial.

[codecov-io]

Codecov Report

Merging #156 into master will increase coverage by 0.53%.
The diff coverage is 90.24%.

@@            Coverage Diff             @@
##           master     #156      +/-   ##
==========================================
+ Coverage   92.88%   93.42%   +0.53%     
==========================================
  Files          87       89       +2     
  Lines        1167     1171       +4     
  Branches       71       79       +8     
==========================================
+ Hits         1084     1094      +10     
+ Misses         83       77       -6     

Impacted Files	Coverage Δ
.../com/comcast/money/akka/SpanContextWithStack.scala	64.70% <ø> (ø)
...main/scala/com/comcast/money/core/Formatters.scala	40.00% <0.00%> (ø)
...a/com/comcast/money/core/MoneyTracerProvider.scala	87.50% <ø> (ø)
...rc/main/scala/com/comcast/money/core/Tracers.scala	30.00% <0.00%> (ø)
.../scala/com/comcast/money/core/UnrecordedSpan.scala	14.28% <0.00%> (ø)
...omcast/money/core/formatters/EgressFormatter.scala	0.00% <0.00%> (ø)
.../com/comcast/money/core/formatters/Formatter.scala	100.00% <ø> (ø)
...mcast/money/core/formatters/IngressFormatter.scala	0.00% <0.00%> (ø)
...st/money/core/formatters/MoneyTraceFormatter.scala	100.00% <ø> (ø)
.../money/core/formatters/TraceContextFormatter.scala	100.00% <ø> (ø)
... and 33 more

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[ptravers]

Ooof thanks for doing this!

[HaloFour]

Of course they decided to change the packages for everything, so the PR looks huge now. 😄

[HaloFour]

I'm taking the WIP label off. I've adopted the late-breaking changes and switched the dependencies to the release build (and removing the snapshot repository).