ExtractSampledTraceID works like ExtractTraceID but the returned bool is only true if the returned trace id is sampled.

ExtractTraceID extracts the trace id, if any from the context.

NewFromEnv is a convenience function to allow tracing configuration via environment variables Tracing will be enabled if one (or more) of the following environment variables is used to configure trace reporting: - JAEGER_AGENT_HOST - JAEGER_SAMPLER_MANAGER_HOST_PORT.

ErrInvalidConfiguration is an error to notify client to provide valid trace report agent or config server.