fix(etcd-defrag): lower defrag threshold from 100MB to 50MB free space

[Tanguille]

Reduces the etcd defrag free-space threshold from 100MB to 50MB so defrag runs earlier when DB page count grows but stays under the 50% quota usage trigger. This helps reclaim space more proactively on the control plane etcd instances.

Summary by CodeRabbit

• Bug Fixes
  • Updated the etcd defragmentation schedule to run when less free database space remains, improving storage maintenance behavior.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 78726526-ee92-4484-a0d9-340585dd1311

📥 Commits

Reviewing files that changed from the base of the PR and between 856afb6 and 17a9513.

📒 Files selected for processing (1)

• kubernetes/apps/kube-system/etcd-defrag/app/helmrelease.yaml

🔗 Linked repositories identified

CodeRabbit considers these linked repositories for cross-repo context during reviews:

• Tanguille/LLMKube (auto-detected)

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📝 Walkthrough

Walkthrough

The etcd-defrag HelmRelease lowers the free-space threshold in its defragmentation rule from 100 MiB to 50 MiB and updates the accompanying comment.

Changes

etcd defragmentation

Layer / File(s)	Summary
Update defragmentation rule threshold kubernetes/apps/kube-system/etcd-defrag/app/helmrelease.yaml	The --defrag-rule condition now uses dbSizeFree > 50*1024*1024, with the inline comment updated to reflect the 50 MiB threshold.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change: lowering the etcd-defrag free-space threshold from 100MB to 50MB.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/etcd-defrag-lower-threshold

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_{Comment @coderabbitai help to get the list of available commands.}

[tanguille-cluster]

@@ spec.jobTemplate.spec.template.spec.containers.app.args @@
# batch/v1/CronJob/kube-system/etcd-defrag
! - one list entry removed:
- - "--defrag-rule=dbQuotaUsage > 0.5 || dbSizeFree > 100*1024*1024"
! + one list entry added:
+ - "--defrag-rule=dbQuotaUsage > 0.5 || dbSizeFree > 50*1024*1024"

[tanguille-cluster]

@@ spec.values.controllers.etcd-defrag.containers.app.args @@
# helm.toolkit.fluxcd.io/v2/HelmRelease/kube-system/etcd-defrag
! - one list entry removed:
- - "--defrag-rule=dbQuotaUsage > 0.5 || dbSizeFree > 100*1024*1024"
! + one list entry added:
+ - "--defrag-rule=dbQuotaUsage > 0.5 || dbSizeFree > 50*1024*1024"