Misc fixes for nginx-ingress chart for better keel and prom-oper

[phntom]

Ability to add labels to controller deployment for keel.sh and 2 useful alerts

What this PR does / why we need it:

keel.sh labels integration
useful prometheus operator alertmanager alerts

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?

==> Linting ingress-nginx

1 chart(s) linted, 0 chart(s) failed

helm install'ed on EKS and Linode with prometheus-operator and kee.sh installed.
examples of usage provided as comments next to changed sections in values.yaml

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.

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Hi @phntom. 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.

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[phntom]

I signed it

[ChiefAlexander]

As this is adding new functionality let's bump the minor version:

Suggested change

	version: 2.13.1
	version: 2.14.0

[ChiefAlexander]

/ok-to-test

[ChiefAlexander]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ChiefAlexander, phntom

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• charts/ingress-nginx/OWNERS [ChiefAlexander]

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