fix(gateway): reduce prometheus shared dict to 128m

[jarvis9443]

Reduce the default gateway Prometheus shared dictionary from 256m to 128m on the 3.10 chart line.

This also bumps the gateway chart patch version to 3.10.6 so the updated default can be published.

Summary by CodeRabbit

• Chores

  • Updated the Gateway Helm chart version to 3.10.6.

• Configuration

  • Reduced the default Prometheus metrics shared-memory allocation from 256 MB to 128 MB.
  • Updated the chart documentation to reflect the new default.

[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

Run ID: 877d91f3-c940-4543-bc75-0e9d5f17ab21

📥 Commits

Reviewing files that changed from the base of the PR and between 7fdc655 and 3ac8391.

📒 Files selected for processing (3)

• charts/gateway/Chart.yaml
• charts/gateway/README.md
• charts/gateway/values.yaml

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📝 Walkthrough

Walkthrough

The gateway Helm chart version was bumped to 3.10.6, and the Prometheus metrics shared-dict default was reduced from 256m to 128m in both chart values and README documentation.

Changes

Gateway chart update

Layer / File(s)	Summary
Prometheus shared-dict configuration charts/gateway/values.yaml, charts/gateway/README.md	The prometheus-metrics shared-dict default changed from 256m to 128m in chart configuration and documentation.
Chart version bump charts/gateway/Chart.yaml	The Helm chart version changed from 3.10.5 to 3.10.6.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Possibly related PRs

• api7/api7-helm-chart#263: Updates the gateway chart version in charts/gateway/Chart.yaml.
• api7/api7-helm-chart#303: Updates gateway chart version metadata in charts/gateway/Chart.yaml.
• api7/api7-helm-chart#267: Updates the gateway chart version field in charts/gateway/Chart.yaml.

Suggested reviewers: nic-6443

🚥 Pre-merge checks | ✅ 6

✅ Passed checks (6 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly reflects the main change: reducing the gateway Prometheus shared dict to 128m.
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.
E2e Test Quality Review	✅ Passed	Config-only chart update: values, README, and chart version all align; no test code changed and no E2E flow is impacted.
Security Check	✅ Passed	Only Helm chart version/docs and a shared-dict default changed; no logging, auth, secret storage, TLS, or access-control code was modified.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/prometheus-shm-128m-3.10

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