Init returns an instance of Jaeger Tracer that samples probability% of traces and logs all spans to stdout.

New trace instance with given operationName.

OperationNameFromContext returns the `operationName` previously associated with `ctx`, or `""` if not found.

OperationNameFromSpan returns the `operationName` previously associated with `span`, or `""` if not found.

SpanFromContext returns the `Span` previously associated with `ctx`, or `nil` if no such `Span` could be found.

TraceIdFromContext returns the `traceId` previously associated with `ctx`, or `""` if not found.

TraceIdFromSpan returns the `traceId` previously associated with `span`, or `""` if not found.

TraceSpanIdFromContext returns the `traceId` and `spanId` previously associated with `ctx`, or `""` if not found.

TraceSpanIdFromSpan returns the `traceId` and `spanId` previously associated with `span`, or `""` if not found.