code: function logFinalResults(batch, finalError, context) {
    const summary = batch ? batch.summarizeFinalResults(finalError) : undefined;
    context.info(`Summarized final batch results: ${JSON.stringify(summary)}`);
  }
docs: Summarizes and logs the final results of the given batch - converting lists of messages and records into counts.
  @param {Batch} batch - the batch that was processed
  @param {Error|undefined} [finalError] - the final error with which the batch was terminated (if unsuccessful)
  @param {StreamConsumerContext} context - the context to use