Metrics: Remove ingress_upstream_latency_seconds.

[chengjoey]

What this PR does / why we need it:

fix nginx controller oom due to ingress_upstream_latency_seconds metric

ingress_upstream_latency_seconds will cause nginx pod oom, and this metric has been deprecated, so we can delete this

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• CVE Report (Scanner found CVE and adding report)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation only

Which issue/s this PR fixes

#10141

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 unit and/or e2e tests to cover my changes.
• All new and existing tests passed.

[k8s-ci-robot]

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[Gacko]

Hey! Thanks for your contribution, you're having a streak today, right? 😉

We can of course remove this metric if it's causing trouble, but sadly not in an upcoming patch release. I'd postpone this to v1.12.

@strongjz WDYT?

[Gacko]

/triage accepted
/kind bug
/priority backlog
/hold

[Gacko]

/assign

[Gacko]

/ok-to-test

[strongjz]

/lgtm
/approved

[Gacko]

/lgtm

[Gacko]

/unhold

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: chengjoey, Gacko, strongjz

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• OWNERS [Gacko,strongjz]

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