Duration is a log.Field for Duration values.

SpanFromContextOrNoop is the same as opentracing.SpanFromContext, but instead of returning nil, it returns a NoopTracer span if ctx doesn't already have an associated span.

StartSpanFromContext is the same as opentracing.StartSpanFromContext, but instead of always using the global tracer, it attempts to use the parent span's tracer if it's available.

Time is a log.Field for time.Time values.

TracingBackendJaeger indicates the Jaeger backend should be used.

TracingBackendLightstep indicates the LightStep backend should be used.

TracingBackendOpenTelemetry indicates the OpenTelemetry backend should be used.

TracingConfiguration configures an opentracing backend for m3query to use.