Adding TCP retransmits metrics to xml log file

[pratikb2805]

Description of code change

Adding tcp restransmits(--show-tcp-retrans) metrics to xml log output(-x) and json log output(-j)
The metrics include

• retrans segs
• retrans_segments/sec
• lost_retrans/sec
• syn_retrans/sec
• fast_retrans/sec
• forward_retrans/sec
• slowStart_retrans/sec
• retrans_fail/sec

List of Test cases tested

1. Tested with -x and --show-tcp-retrans
   Output:

	...
	<bufferLen>0</bufferLen>
	<tcp_retransmits metric="retrans_segs">1119</tcp_retransmits>
	<tcp_retransmits metric="retrans_segments_per_sec">109.00</tcp_retransmits>
	<tcp_retransmits metric="lost_retrans_per_sec">1.07</tcp_retransmits>
	<tcp_retransmits metric="syn_retrans_per_sec">0.00</tcp_retransmits>
	<tcp_retransmits metric="fast_retrans_per_sec">36.82</tcp_retransmits>
	<tcp_retransmits metric="forward_retrans_per_sec">0.00</tcp_retransmits>
	<tcp_retransmits metric="slowStart_retrans_per_sec">13.34</tcp_retransmits>
	<tcp_retransmits metric="retrans_fail_per_sec">0.00</tcp_retransmits>
	<cpu_cores metric="cpu cores">12</cpu_cores>
	<cpu_speed metric="MHz">2295.702</cpu_speed>
	...

2. Tested with -x and without --show-tcp-retrans

	...
	<bufferCount>0</bufferCount>
	<bufferLen>0</bufferLen>
	<cpu_cores metric="cpu cores">12</cpu_cores>
	<cpu_speed metric="MHz">2295.702</cpu_speed>
	...

3. Tested without either of -x and --show-tcp-retrans

17:26:21 INFO: test duration    :10.59 seconds
17:26:21 INFO: total bytes      :94057136128
17:26:21 INFO:   throughput     :71.08Gbps
17:26:21 INFO:   retrans segs   :1357
17:26:21 INFO: cpu cores        :12
17:26:21 INFO:   cpu speed      :2295.702MHz
17:26:21 INFO:   user           :1.51%
17:26:21 INFO:   system         :71.20%
17:26:21 INFO:   idle           :0.00%
17:26:21 INFO:   iowait         :0.00%
17:26:21 INFO:   softirq        :27.29%
17:26:21 INFO:   cycles/byte    :3.10
17:26:21 INFO: cpu busy (all)   :922.73%

4. Tested with -j and --show-tcp-retrans

        ...
        "io" : "0",
        "tcp_retransmits" : [
            {
                "metric" : "retrans_segs",
                "value" : "237"
            },
            {
                "metric" : "retrans_segments_per_sec",
                "value" : "3.95"
            },
            {
                "metric" : "lost_retrans_per_sec",
                "value" : "0.18"
            },
            {
                "metric" : "syn_retrans_per_sec",
                "value" : "0.07"
            },
            {
                "metric" : "fast_retrans_per_sec",
                "value" : "3.72"
            },
            {
                "metric" : "forward_retrans_per_sec",
                "value" : "0.00"
            },
            {
                "metric" : "slowStart_retrans_per_sec",
                "value" : "0.00"
            },
            {
                "metric" : "retrans_fail_per_sec",
                "value" : "0.00"
            }
        ],
        "os" : "Linux IDCREDBOX1000 6.6.87.2-microsoft-standard-WSL2 #1 SMP PREEMPT_DYNAMIC Thu Jun  5 18:30:46 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux"
        ...

5. Without --show-tcp-retrans and with -j

        ...
        "io" : "0",
        "os" : "Linux IDCREDBOX1000 6.6.87.2-microsoft-standard-WSL2 #1 SMP PREEMPT_DYNAMIC Thu Jun  5 18:30:46 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux"
        ...

[kalvdans]

Looks good to me to add xml output of (machine-wide?) TCP statistics.

[pratikb2805]

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