Improve documentation of robustness test adding key concepts used in the test

[serathius]

cc @ahrtr @fuweid @henrybear327 @siyuanfoundation @MadhavJivrajani @jmhbnz

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 47.72727% with 46 lines in your changes missing coverage. Please review.

Project coverage is 68.73%. Comparing base (f5acd17) to head (954d00c).
Report is 65 commits behind head on main.

❗ Current head 954d00c differs from pull request most recent head bd0d1a6

Please upload reports for the commit bd0d1a6 to get more accurate results.

Files with missing lines	Patch %	Lines
etcdctl/ctlv3/command/global.go	0.00%	12 Missing ⚠️
etcdctl/ctlv3/command/make_mirror_command.go	0.00%	10 Missing ⚠️
etcdctl/ctlv3/command/ep_command.go	0.00%	6 Missing ⚠️
client/v3/mock/mockserver/mockserver.go	0.00%	4 Missing ⚠️
client/v3/config.go	87.50%	1 Missing and 1 partial ⚠️
client/v3/snapshot/v3_snapshot.go	0.00%	2 Missing ⚠️
etcdctl/ctlv3/ctl.go	0.00%	2 Missing ⚠️
pkg/netutil/netutil.go	50.00%	2 Missing ⚠️
client/v3/client.go	80.00%	0 Missing and 1 partial ⚠️
client/v3/experimental/recipes/key.go	50.00%	1 Missing ⚠️
... and 4 more

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Additional details and impacted files

Files with missing lines	Coverage Δ
client/v3/lease.go	90.87% <100.00%> (ø)
client/v3/retry.go	79.48% <100.00%> (+0.17%)	⬆️
client/v3/retry_interceptor.go	65.61% <100.00%> (ø)
client/v3/watch.go	92.84% <100.00%> (-0.80%)	⬇️
etcdctl/ctlv3/command/printer_json.go	0.00% <ø> (ø)
etcdctl/ctlv3/command/watch_command.go	44.08% <ø> (ø)
pkg/adt/interval_tree.go	88.72% <ø> (ø)
pkg/expect/expect.go	79.12% <100.00%> (ø)
pkg/featuregate/feature_gate.go	87.66% <100.00%> (ø)
pkg/flags/flag.go	68.57% <100.00%> (ø)
... and 24 more

... and 21 files with indirect coverage changes

@@           Coverage Diff           @@
##             main   #18708   +/-   ##
=======================================
  Coverage   68.72%   68.73%           
=======================================
  Files         420      420           
  Lines       35494    35508   +14     
=======================================
+ Hits        24395    24405   +10     
- Misses       9665     9667    +2     
- Partials     1434     1436    +2     

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[jmhbnz]

/retest

[jmhbnz]

LGTM - Thanks @serathius

[henrybear327]

LGTM! Thanks @serathius ! :)

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: fuweid, henrybear327, jmhbnz, serathius

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• OWNERS [jmhbnz,serathius]

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