Examples of network policies troubleshooting using JSON format

[aojea]

The json logging can be very powerful to troubleshoot network policies, specially using the packet json format and the results of the evaluation, it will be nice to document some examples on how to use it

{
  "ts": 1720777151838.3552,
  "caller": "networkpolicy/controller.go:461",
  "msg": "Evaluating packet",
  "v": 2,
  "packet": {
    "Id": 9,
    "Family": "IPv4",
    "SrcIP": "11.0.3.3",
    "DstIP": "11.0.2.2",
    "Proto": "TCP",
    "SrcPort": 33803,
    "DstPort": 6000
  }
}

Text output is not altered:

I0712 09:53:52.257809       1 controller.go:461] "Evaluating packet" packet=<
        [8] 11.0.1.3:40243 11.0.2.2:6000 TCP
        00000000  00 00 a0 02 fa f0 19 33  00 00 02 04 05 b4 04 02  |.......3........|
        00000010  08 0a c1 d9 c1 bd 00 00  00 00 01 03 03 07        |..............|
 >

Originally posted by @uablrek in #50 (comment)

[phuhung273]

Hi @aojea, can you please help suggesting where is the most suitable place to put this doc. Is it fine to put right in the home README.md ?

[uablrek]

Please mention formatting with jq

[aojea]

Add a subsection called Advanced so we can keep adding documentation, and from that subsection we can have a list of links to the docs folder.
You add the new document it in docs and you link it from the readme, it has to be a meaningful title as "Using JSON logging for troubleshooting network policies" per example

[phuhung273]

thanks @aojea @uablrek for supporting. I will give a try.

/assign