NewProvider create an instance of tracer provider.

NewSpan returns a new span from the global tracer.

SpanFromContext returns the current span from a context.

WithEndpoint defines the full URL to the Jaeger HTTP Thrift collector.

WithInstanceID defines the instance id.

WithSamplingRatio defines the sampling ratio.

WithServiceName defines service name.

Config is the config for tracer.

Option the tracer provider option.