Configure User-Agent

[sylr]

What this PR does / why we need it:

It configures the user agent so that api server metrics gets a correct label value instead of:

nginx-ingress-controller/v0.0.0 (linux/amd64) kubernetes/$Format

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Which issue/s this PR fixes

How Has This Been Tested?

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I've read the CONTRIBUTION guide
• I have added tests to cover my changes.
• All new and existing tests passed.

[k8s-ci-robot]

Hi @sylr. Thanks for your PR.

I'm waiting for a kubernetes 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.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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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/test-infra repository.

[aledbf]

/ok-to-test

[codecov-commenter]

Codecov Report

Merging #5700 into master will increase coverage by 0.08%.
The diff coverage is 10.00%.

@@            Coverage Diff             @@
##           master    #5700      +/-   ##
==========================================
+ Coverage   58.56%   58.65%   +0.08%     
==========================================
  Files          88       88              
  Lines        6948     6951       +3     
==========================================
+ Hits         4069     4077       +8     
+ Misses       2431     2425       -6     
- Partials      448      449       +1     

Impacted Files	Coverage Δ
cmd/nginx/main.go	5.37% <10.00%> (-0.62%)	⬇️
internal/task/queue.go	77.92% <0.00%> (-2.60%)	⬇️
internal/ingress/controller/template/template.go	79.73% <0.00%> (-0.17%)	⬇️
internal/ingress/types_equals.go	17.09% <0.00%> (-0.10%)	⬇️
internal/ingress/controller/controller.go	49.59% <0.00%> (-0.06%)	⬇️
internal/ingress/annotations/sslcipher/main.go	100.00% <0.00%> (ø)
internal/ingress/controller/nginx.go	30.00% <0.00%> (+0.27%)	⬆️
...ternal/ingress/annotations/sessionaffinity/main.go	60.41% <0.00%> (+1.59%)	⬆️
internal/ingress/controller/process/nginx.go	100.00% <0.00%> (+67.64%)	⬆️

---

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[sylr]

/retest

[aledbf]

/lgtm
/approve

[aledbf]

@sylr thanks!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aledbf, sylr

The full list of commands accepted by this bot can be found here.

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Needs approval from an approver in each of these files:

• OWNERS [aledbf]

Approvers can indicate their approval by writing /approve in a comment
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[aledbf]

/retest

[aledbf]

/retest

[aledbf]

/retest

[aledbf]

/retest

[aledbf]

/retest