log(name, fields, time) {
		time = time || this.getTime();

		this.logs.push({
			name,
			fields: fields || {},
			time,
			elapsed: time - this.startTime
		});

		this.logger.debug(`[${this.id}] Span '${this.name}' has a new log event: ${name}.`);

		return this;
	}
Log a trace event.

@param {String} name
@param {Object?} fields
@param {Number?} time
@returns {Span}
@memberof Span