To improve HTTP-TPC transfer monitoring and for better transfer issue diagnosis WLCG BDT group proposed HTTP-TPC update which adds new Perf Marker entries that provide real transfer connection source (Stripe Source) and destination (Stripe Source) addresses. The address format is same as defined for RemoteConnections and it is composed of transport protocol, address and port separated by :, e.g. tcp:192.0.2.100:1234 or tcp:[2001:db8::100]:1234.

Example of whole performance marker with proposed extension:

Perf Marker\n
Timestamp: 1537788010\n
Stripe Index: 0\n
Stripe Bytes Transferred: 238745\n
Total Stripe Count: 1\n
RemoteConnections: tcp:147.231.25.166:21234,tcp:[2001:718:401:6017:2::28]:24081\n
Stripe Source: tcp:[2001:718:401:6017:2::28]:24081\n
Stripe Destination: tcp:[2001:1458:301:105::100:5]:8443\n
End\n

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