docs: function _log_time(sample) {
  
  	debug.assert(sample).is('object');
  	debug.assert(sample.event).is('string');
  	debug.assert(sample.start).is('date');
  	debug.assert(sample.end).is('date');
  	debug.assert(sample.duration).ignore(undefined).is('number');
  	debug.assert(sample.query).ignore(undefined).is('string');
  	debug.assert(sample.params).ignore(undefined).is('array');
  
  	var msg = 'NoPg event ' + sample.event + ' in ' + sample.duration + ' ms';
  	if(sample.query || sample.params) {
  		msg += ': ';
  	}
  	if(sample.query) {
  		msg += 'query=' + util.inspect(sample.query);
  		if(sample.params) {
  			msg += ', ';
  		}
  	}
  	if(sample.params) {
  		msg += 'params=' + util.inspect(sample.params);
  	}
  	debug.log(msg);
  
  }