for example here's me posting a snippet of ten million lines: 
```
Aug 03 16:01:01 catircservices synapse[380389]: synapse.federation.sender.transaction_manager: [federation_transaction_transmission_loop-25547] TX [rubdos.be] {1690782363496} got 200 response
Aug 03 16:01:01 catircservices synapse[380389]: synapse.federation.sender.transaction_manager: [federation_transaction_transmission_loop-25548] TX [group.lt] {1690782363497} Sending transaction [1690782363497], (PDUs: 0, EDUs: 1)
Aug 03 16:01:01 catircservices synapse[380389]: synapse.federation.sender.transaction_manager: [federation_transaction_transmission_loop-25549] TX [matrix.domainepublic.net] {1690782363498} Sending transaction [1690782363498], (PDUs: 0, EDUs: 1)
Aug 03 16:01:01 catircservices synapse[380389]: synapse.federation.sender.transaction_manager: [federation_transaction_transmission_loop-25550] TX [mtrx.brinsche.de] {1690782363499} Sending transaction [1690782363499], (PDUs: 11, EDUs: 2)
Aug 03 16:01:02 catircservices synapse[380389]: synapse.federation.sender.transaction_manager: [federation_transaction_transmission_loop-25551] TX [thaumic.dev] {1690782363500} Sending transaction [1690782363500], (PDUs: 0, EDUs: 1)