Renaming SpanContext to SpanReference

[eddynaka]

Fixes #1377.

Changes

Please provide a brief description of the changes here.

For significant contributions please make sure you have completed the following items:

• CHANGELOG.md updated for non-trivial changes
• Design discussion issue #
• Changes in public API reviewed

[codecov]

Codecov Report

Merging #1378 into master will decrease coverage by 0.03%.
The diff coverage is 89.36%.

@@            Coverage Diff             @@
##           master    #1378      +/-   ##
==========================================
- Coverage   81.80%   81.77%   -0.04%     
==========================================
  Files         226      226              
  Lines        5991     5991              
==========================================
- Hits         4901     4899       -2     
- Misses       1090     1092       +2     

Impacted Files	Coverage Δ
...penTelemetry.Api/Metrics/NoopBoundCounterMetric.cs	0.00% <ø> (ø)
...penTelemetry.Api/Metrics/NoopBoundMeasureMetric.cs	0.00% <ø> (ø)
src/OpenTelemetry.Api/Metrics/NoopCounterMetric.cs	14.28% <ø> (ø)
...enTelemetry/Metrics/DoubleBoundCounterMetricSdk.cs	75.00% <ø> (ø)
...enTelemetry/Metrics/DoubleBoundMeasureMetricSdk.cs	0.00% <ø> (ø)
...penTelemetry/Metrics/Int64BoundCounterMetricSdk.cs	75.00% <ø> (ø)
...penTelemetry/Metrics/Int64BoundMeasureMetricSdk.cs	66.66% <ø> (ø)
src/OpenTelemetry.Api/Metrics/MeasureMetric.cs	25.00% <50.00%> (ø)
...rc/OpenTelemetry/Metrics/DoubleCounterMetricSdk.cs	45.45% <50.00%> (ø)
src/OpenTelemetry/Metrics/Int64CounterMetricSdk.cs	45.45% <50.00%> (ø)
... and 11 more

[reyang]

LGTM.

[CodeBlanch]

One comment but otherwise LGTM

[carlosalberto]

Not an approver here but you may want to hold this, as (it seems) we will stick to SpanContext, as mentioned in the Spec SIG call.

[eddynaka]

Not an approver here but you may want to hold this, as (it seems) we will stick to SpanContext, as mentioned in the Spec SIG call.

Oh really? do you have an issue/pr in the spec so we can follow? Thanks for the heads up!

[carlosalberto]

@eddynaka Yes, I will prepare a PR in a bit (today, that is) ;)

[reyang]

Ping back from open-telemetry/opentelemetry-specification#1126

[eddynaka]

Since they reverted, I'm closing this and updating the issue, pointing to the spec reversion.