Difference between Meraki dashboard and netflow graph

The documentation (Network fields) specifies the field "network.bytes" is the sum of "source.bytes" and "destination.bytes".

In my case this fields are missing. I have only this values :

  • netflow.octet_delta_count
  • netflow.packet_delta_count
  • netflow.post_octet_delta_count
  • netflow.post_packet_delta_count

On the other side, Meraki specifies (Meraki netflow overview) the netflow template sent and specially two field used to collect bytes :

  • bytes
  • out_bytes

I don't understand why I have differents values, the relationship between them and how the network.bytes is calculated. Is this possible to have some explication about this ?