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To improve HTTP-TPC transfer monitoring and for better transfer issue diagnosis WLCG BDT group [proposed HTTP-TPC update](https://twiki.cern.ch/twiki/bin/view/LCG/HttpTpcUpdates#Update4) 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`](https://twiki.cern.ch/twiki/bin/view/LCG/HttpTpcUpdates#Performance_markers) 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](https://twiki.cern.ch/twiki/bin/view/LCG/HttpTpcUpdates#Update4) 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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