Alpha 0.2 Tracing Requirement - SDK

[bobstrecansky]

These are the features in scope for an Alpha 0.2 SDK release from a tracing standpoint:

• [ ] Built-in samplers (percentage sampler).
• [x] SpanProcessor interface
• [x] Batching SpanProcessor
• [x] Exporter interface
• [x] Jaeger and/or Zipkin exporter

Success criteria : Add these features to the 0.2 Alpha release candidate. Full SDK specs for Alpha 0.2 can be found here

[bobstrecansky]

tracing won't work without context propagation, an item we are tracking in https://github.com/open-telemetry/opentelemetry-php/issues/6

Span processors/exporters won't work without a tracer API and minimal implementation, as caputred in https://github.com/open-telemetry/opentelemetry-php/issues/10

[jodeev]

There is one remaining outstanding piece of work to be closed: https://github.com/open-telemetry/opentelemetry-php/issues/162

[bobstrecansky]

Closing this because we are going to eventually skip more towards a more recent alpha release.