stop throttling KKP controllers

[xrstf]

What this PR does / why we need it:
The resource constraints for KKP seed/master controllers are ancient. I (apparently) set them in #3012, a time when there wasn't even a master-controller-manager, but only an "rbac generator". "100m" might have been a useful limit for something that generates RBAC only, but the master-ctrl-mgr nowadays does way more.

We have observed it hitting the 100m CPU limit very often, to a point where even

I1020 11:42:42.896768 1 trace.go:236] Trace[1992949100]: "DeltaFIFO Pop Process" ID:cluster-lrvfphkcvb/front-proxy-ca,Depth:91,Reason:slow event handlers blocking the queue (20-Oct-2023 11:42:42.695) (total time: 201ms):

warnings were logged.

This PR raises the limit considerably, which should make KKP reconciliations much smoother.

What type of PR is this?
/kind bug

Does this PR introduce a user-facing change? Then add your Release Note here:

Increase default CPU limits for KKP API/seed/master-controller-managers to prevent general slowness.

Documentation:

NONE

[embik]

Nit: Let's add information to what new limits we are updating in the release note.

[embik]

/approve

[kubermatic-bot]

LGTM label has been added.

Git tree hash: d4f74e850b254e5b2f50f4689e52844b21606a4f

[kubermatic-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: embik

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• OWNERS [embik]

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[kubermatic-triage-bot]

/retest
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Review the full test history

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[xrstf]

/override pre-kubermatic-test-integration

[kubermatic-bot]

@xrstf: Overrode contexts on behalf of xrstf: pre-kubermatic-test-integration

In response to this:

/override pre-kubermatic-test-integration

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[kubermatic-triage-bot]

/retest
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Review the full test history

Silence the bot with an /lgtm cancel or /hold comment for consistent failures.

[kubermatic-triage-bot]

/retest
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Review the full test history

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[xrstf]

/cherrypick release/v2.23

[xrstf]

/cherrypick release/v2.22

[xrstf]

/cherrypick release/v2.21

[kubermatic-bot]

@xrstf: new pull request created: #12769

In response to this:

/cherrypick release/v2.23

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[kubermatic-bot]

@xrstf: new pull request created: #12770

In response to this:

/cherrypick release/v2.22

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[kubermatic-bot]

@xrstf: #12764 failed to apply on top of branch "release/v2.21":

Applying: stop throttling KKP controllers
Using index info to reconstruct a base tree...
A	docs/zz_generated.kubermaticConfiguration.ce.yaml
A	docs/zz_generated.kubermaticConfiguration.ee.yaml
A	pkg/defaulting/configuration.go
Falling back to patching base and 3-way merge...
Auto-merging pkg/controller/operator/defaults/defaults.go
Auto-merging docs/zz_generated.kubermaticConfiguration.yaml
CONFLICT (modify/delete): docs/zz_generated.kubermaticConfiguration.ee.yaml deleted in HEAD and modified in stop throttling KKP controllers. Version stop throttling KKP controllers of docs/zz_generated.kubermaticConfiguration.ee.yaml left in tree.
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 stop throttling KKP controllers
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

In response to this:

/cherrypick release/v2.21

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.