offsetLagLow() {
    if (this.isEmptyIncludingFiltered()) {
      return '0'
    }

    const lastOffsetOfPartition = Long.fromValue(this.highWatermark).add(-1)
    const firstConsumedOffset = Long.fromValue(this.firstOffset())
    return lastOffsetOfPartition.add(firstConsumedOffset.multiply(-1)).toString()
  }
Returns the lag based on the first offset in the batch