ConvertTimestamp turns a Zipkin timestamp (a Unix timestamp in microseconds) into a time.Time value.

GuessAnnotationType takes a value and, if it is a string, turns it into a bool, int64 or float64 value when possible.

CoreSpanMetadata is the subset of span data that can be added directly into a libhoney event.

Span represents a Zipkin span in a format more useful for consumption in Honeycomb.