feat(charts): deploy opted-in tmpfs PageBroker

[dfeigin-nv]

Adds the opt-in PageBroker sidecar, shared tmpfs staging, and control-socket mounts.

Validation: enabled and disabled Helm renders.

Summary by CodeRabbit

• New Features
  • Added optional Page Broker support to the Snapshot deployment.
  • Configures Page Broker control and staging paths automatically.
  • Added settings for enabling Page Broker, selecting its image and pull policy, limiting concurrent requests, and configuring resource requests and limits.
  • Added configurable memory-backed staging storage with an optional size limit.
  • Page Broker is disabled by default and can be enabled through chart configuration.

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Reviewing files that changed from the base of the PR and between d96f6ec and 3342f11.

📒 Files selected for processing (4)

• charts/snapshot/templates/_helpers.tpl
• charts/snapshot/templates/configmap.yaml
• charts/snapshot/templates/daemonset.yaml
• charts/snapshot/values.yaml

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Walkthrough

The snapshot Helm chart adds optional Page Broker support. It defines control and staging paths, exposes Page Broker configuration, adds a conditional sidecar, mounts shared paths, and provisions an optional memory-backed staging volume.

Changes

Page Broker integration

Layer / File(s)	Summary
Page Broker configuration contract charts/snapshot/templates/_helpers.tpl, charts/snapshot/values.yaml, charts/snapshot/templates/configmap.yaml	The chart defines fixed control and staging paths, disabled-by-default Page Broker values, and conditional ConfigMap settings.
Page Broker DaemonSet wiring charts/snapshot/templates/daemonset.yaml	When enabled, the DaemonSet adds the Page Broker sidecar, passes its paths, mounts shared volumes into the agent, and creates a memory-backed staging volume with an optional size limit.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: 🟡 Moderate · up to 3342f

When enabled, the chart provisions an unbounded memory-backed staging volume and a PageBroker sidecar without CPU or memory requests or limits, creating a concrete risk of node memory pressure and resource contention. Merge should wait for explicit resource bounds or owner acceptance.

🚥 Pre-merge checks | ✅ 7

✅ Passed checks (7 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title uses the required feat prefix, stays under 72 characters, and clearly describes the opt-in PageBroker deployment.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (4 skipped: 4 unsupported.)
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.
Breaking Api Changes	✅ Passed	The parent-to-HEAD diff changes only Helm chart files; api/** has no changes, so no exported field, JSON tag, default/optional marker, or XValidation marker changed.
Rbac Least Privilege	✅ Passed	The PR changes no RBAC files or kubebuilder markers. Existing Helm RBAC rules and markers use explicit verbs and resources; no wildcard grant is present.

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Inline comments:
In `@charts/snapshot/templates/daemonset.yaml`:
- Around line 109-121: Add a resources block to the pagebroker container
rendered when pageBroker.enabled is true, mapping non-empty CPU and memory
requests and limits from pageBroker.resources. Keep the existing image,
arguments, and volume mounts unchanged.

In `@charts/snapshot/values.yaml`:
- Around line 78-80: Update the pageBroker configuration defaults so
stagingSizeLimit is non-empty or validation rejects an empty value, and add
PageBroker container resource requests and limits. Ensure the rendered
memory-backed staging volume is bounded and PageBroker cannot consume unbounded
node memory.

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📒 Files selected for processing (4)

• charts/snapshot/templates/_helpers.tpl
• charts/snapshot/templates/configmap.yaml
• charts/snapshot/templates/daemonset.yaml
• charts/snapshot/values.yaml

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