code: func (m *MultiLog) PostSessionSlice(slice SessionSlice) error {
  	var errors []error
  	for _, log := range m.loggers {
  		errors = append(errors, log.PostSessionSlice(slice))
  	}
  	return trace.NewAggregate(errors...)
  }
docs: // DELETE IN: 2.7.0
  // This method is no longer necessary as nodes and proxies >= 2.7.0
  // use UploadSessionRecording method.
  // PostSessionSlice sends chunks of recorded session to the event log