fix for #19066 Print warnings when deprecated options are configured in config file

[mansoor17syed]

fix for #19066 Print warnings when deprecated options are configured in config file

Issue Details
Add warnings when deprecated options are configured
Problem: Currently, etcd doesn't warn users when they configure deprecated options
Goal: Improve user experience by warning about deprecated configurations before they're removed
Solution Overview

Implementation Location: server/config/config.go

[k8s-ci-robot]

Hi @mansoor17syed. Thanks for your PR.

I'm waiting for a etcd-io member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[serathius]

/ok-to-test

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.89%. Comparing base (d5231c7) to head (70b0e50).
Report is 18 commits behind head on main.

Additional details and impacted files

Files with missing lines	Coverage Δ
server/etcdmain/config.go	71.05% <100.00%> (+3.28%)	⬆️

... and 27 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #19148      +/-   ##
==========================================
+ Coverage   68.77%   68.89%   +0.12%     
==========================================
  Files         420      420              
  Lines       35640    35649       +9     
==========================================
+ Hits        24510    24561      +51     
+ Misses       9704     9665      -39     
+ Partials     1426     1423       -3     

---

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[ahrtr]

This PR doesn't fix #19066 . Please follow #18998 (comment)

Thanks anyway

[mansoor17syed]

Hi @ahrtr

Thank you for the review and feedback!

I initially assumed that the comment in the earlier PR referred specifically to their changes. Could you please confirm if the fix for issue #19066 is intended to address the comment you provided here : #18998 (comment)

Appreciate your clarification!

[ahrtr]

Could you please confirm if the fix for issue #19066 is intended to address the comment you provided here : #18998 (comment)

YES

[ahrtr]

I just realised that we can iterate FlagsExplicitlySet directly in parse(). Both configFromFile and configFromCmdLine populate the data structure with all flags,

etcd/server/embed/config.go

Line 486 in 75f2ae1

FlagsExplicitlySet map[string]bool

sorry for the back and forth.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: mansoor17syed
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[mansoor17syed]

@ahrtr

Can you Please have a look once now if I have done the right changes
I see one tests failing , but I guess the failure is not because of my changes

Still open for feedback and suggestions
do let me know

[ahrtr]

@mansoor17syed The change looks good. Please squash the commits

[ahrtr]

Could you please also add a test to cover the config file case?

[k8s-ci-robot]

@mansoor17syed: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-etcd-robustness-amd64	70b0e50	link	true	/test pull-etcd-robustness-amd64
pull-etcd-robustness-arm64	70b0e50	link	true	/test pull-etcd-robustness-arm64

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository. I understand the commands that are listed here.

[mansoor17syed]

@ahrtr

can chk now I have added the UT but some seems failing I doubt its because of my changes.
Still open for feedback and suggestions
do let me know