Tyler Yahn d143b8fbf8 Unify API Span Start/End Options (#1108) ... * Unify API Span Start/End Options Replace both with `SpanOption`. Add a unified `SpanConfig` to match and a `SpanConfigure` function to parse a `SpanConfig` from `SpanOption`s. Update all the related options to use new `SpanOption`s. * No non-zero SpanConfig defaults The SDK uses an internal clock for the current time that cannot be use if it does not know the time has not been set. * Append attributes for WithAttributes This preserves existing behavior. * Add unit test for SpanConfigure * Propagate changes * Update append option documentation * Update testing comments * Move comments on guarantees to appropriate function * Add documentation for SDK methods Include SDK implementation specific information in the Tracer Start method and Span End method. * Add changes to Changelog * Apply suggestions from code review Co-authored-by: ET <evantorrie@users.noreply.github.com> * Update the SpanKind comment in the SpanConfig Try for a less tautological comment. Co-authored-by: ET <evantorrie@users.noreply.github.com>		2020-09-03 07:34:36 -07:00
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doc.go	Update License header for all source files (#586)	2020-03-23 22:41:10 -07:00
mock.go	Unify API Span Start/End Options (#1108)	2020-09-03 07:34:36 -07:00