feat(postgres): per-application allocation ratio (resourcesAllocationRatio) by yrahman82 · Pull Request #4907 · cozystack/cozystack

yrahman82 · 2026-10-13T18:17:46Z

What this PR does

Requests in Cozystack apps are derived from limits by the cluster-wide cpu-allocation-ratio and memory-allocation-ratio only, so there is no way to let one database keep a high limit while reserving what it normally uses without changing the ratio for every application in the cluster, system components included. Platforms that bill by use and give each database a generous limit need this per instance.

This adds an optional resourcesAllocationRatio: {cpu, memory} that cozy-lib.resources.sanitize reads from the application's own values before falling back to the cluster-wide ratio. Postgres is the first application to expose it; others can opt in the same way.

Unset (the default, and every existing instance), the rendered requests are unchanged.
A ratio below 1 is refused at render, since the request would exceed the limit.
Per resource: setting only memory leaves CPU on the cluster-wide ratio.

How it was checked, since cozy-lib is shared by every app:

Rendered all 35 charts that link cozy-lib with their default values on main and on this branch: identical output (after masking per-render random passwords).
Ran helm unittest in every chart that has tests (119) on main and on this branch: identical results except the new tests (postgres 209 → 212, cozy-lib-tests 68 → 75). The charts whose tests fail on main fail identically here.
New cases in packages/tests/cozy-lib-tests (unset, empty map, cluster-wide ratio still applied, memory override with the limit unchanged, app ratio winning per resource, ratio 1, ratio below 1 refused) and in packages/apps/postgres/tests (16Gi limit with memory ratio 8 reserves 2Gi; unset reserves the limit; below 1 refused).
make generate in packages/apps/postgres is clean; deepcopy regenerated for the new type.

Screenshots

No UI change.

Downstream repositories

I left every box empty on purpose: cozystack/terraform-provider-cozystack types the Postgres spec by hand, so it will need the new top-level resourcesAllocationRatio field, but its exact shape may change in review here. I will open the follow-up there once the direction is accepted. The managed-apps reference on the website is regenerated from the package README on a stable tag.

Release note

feat(postgres): `resourcesAllocationRatio` overrides the cluster-wide CPU and memory allocation ratios for one Postgres instance, so its requests can sit below a high limit without changing the ratio for every application. Unset, nothing changes.

Summary by CodeRabbit

New Features
- Added optional per-database CPU and memory allocation ratios for PostgreSQL. Set values override cluster-wide ratios; unspecified values retain existing behavior.
- Memory allocation ratios adjust memory requests while leaving limits unchanged.
- Ratios must be at least 1; lower values are rejected.
Documentation
- Updated PostgreSQL configuration guidance to describe the new settings and their defaults.

…Ratio) Requests are derived from limits by the cluster-wide cpu/memory allocation ratios only, so an operator who wants one database to keep a high limit while reserving what it normally uses has to change the ratio for every application in the cluster. A platform that bills by use and offers a generous limit per database needs the override per instance. cozy-lib reads an optional resourcesAllocationRatio.{cpu,memory} from the application's values before the cluster-wide ratio; unset, the rendered requests are unchanged for every chart that uses sanitize. A ratio below 1 is refused because the request would exceed the limit. Postgres is the first application to expose the value. Assisted-by: LLM Signed-off-by: Yasar Rahman <[email protected]>

coderabbitai · 2026-10-13T18:18:26Z

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📥 Commits

Reviewing files that changed from the base of the PR and between 36ef500 and 87bc123.

📒 Files selected for processing (5)

api/apps/v1alpha1/postgresql/types.go
packages/apps/postgres/tests/resources_allocation_ratio_test.yaml
packages/apps/postgres/values.schema.json
packages/apps/postgres/values.yaml
packages/system/postgres-rd/cozyrds/postgres.yaml

🚧 Files skipped from review as they are similar to previous changes (4)

packages/apps/postgres/values.schema.json
packages/system/postgres-rd/cozyrds/postgres.yaml
packages/apps/postgres/values.yaml
api/apps/v1alpha1/postgresql/types.go

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📝 Walkthrough

Applications can now set CPU and memory resource allocation ratios. Shared resource templates use valid application-level ratios before cluster-wide ratios or defaults. PostgreSQL configuration, chart schemas, and tests cover the settings and their effects.

Changes: Application resource ratios

Layer / File(s)	Summary
Define application ratio configuration `api/apps/v1alpha1/postgresql/types.go`, `api/apps/v1alpha1/postgresql/zz_generated.deepcopy.go`, `packages/apps/postgres/values.yaml`, `packages/apps/postgres/values.schema.json`, `packages/system/postgres-rd/cozyrds/postgres.yaml`, `packages/apps/postgres/README.md`	PostgreSQL configuration and chart values add optional CPU and memory allocation ratios. Deep-copy methods, schema, dashboard ordering, and documentation include the new settings.
Resolve application ratios `packages/library/cozy-lib/templates/_resources.tpl`, `packages/tests/cozy-lib-tests/tests/resources_app_ratio_test.yaml`	Shared templates prefer valid application-level ratios, then use cluster configuration or defaults. Tests cover precedence, fallback, request calculations, and rejection of ratios below 1.
Verify PostgreSQL chart requests `packages/apps/postgres/tests/resources_allocation_ratio_test.yaml`	Helm tests check memory request calculations, unchanged limits, and template failure when the ratio is below 1.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Feature

Merge Risk: ⚪ Minimal · up to 87bc1

The per-application ratios reach PostgreSQL rendering, with unset values retaining cluster fallback behavior and configured ratios affecting requests as intended. No merge-blocking issue was identified; proceed with normal checks.

Pre-merge checks · 5

Passed checks (5 passed)

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly and concisely describes the main change: adding per-application PostgreSQL allocation ratios through resourcesAllocationRatio.
Docstring Coverage		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 2…
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 1

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Inline comments:
Review comments at @api/apps/v1alpha1/postgresql/types.go:
- Around line 208-210: Add minimum-value annotations of 1 to the cpu and memory
ratio fields in the values.yaml source, then regenerate the derived API and Helm
schemas so they reject values below 1. Keep the template guard for callers that
bypass schema validation.

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📥 Commits

Reviewing files that changed from the base of the PR and between 588d829 and 36ef500.

📒 Files selected for processing (9)

api/apps/v1alpha1/postgresql/types.go
api/apps/v1alpha1/postgresql/zz_generated.deepcopy.go
packages/apps/postgres/README.md
packages/apps/postgres/tests/resources_allocation_ratio_test.yaml
packages/apps/postgres/values.schema.json
packages/apps/postgres/values.yaml
packages/library/cozy-lib/templates/_resources.tpl
packages/system/postgres-rd/cozyrds/postgres.yaml
packages/tests/cozy-lib-tests/tests/resources_app_ratio_test.yaml

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A ratio of 0 passed the values schema and only failed at render, which leaves the release failing to reconcile until the value is corrected. The schema and the API type now refuse it up front; cozy-lib keeps its render-time guard for callers without a schema. Assisted-by: LLM Signed-off-by: Yasar Rahman <[email protected]>

yrahman82 · 2026-10-17T07:22:26Z

Hi Aleksei Sviridkin (@lexfrei). Can you please review this PR? It will help us and other user significantly by making DB resources scalable on demand.

Expose resourcesAllocationRatio on the Redis, Valkey, RabbitMQ, NATS and Kafka applications, as cozystack#4907 does for PostgreSQL. cozy-lib already reads the value from the application's own values and falls back to the cluster-wide cpu/memory allocation ratios when it is unset, so the rendered requests are unchanged by default. Set, an instance keeps its limits (from resources or resourcesPreset) while its requests follow the ratio: memory 8 on a 16Gi limit reserves 2Gi. The ratio applies to every pod the application sizes through cozy-lib: the Redis/Valkey data and Sentinel pods, the RabbitMQ and NATS replicas, and the Kafka brokers, whose JVM heap is still sized from the limit. A ratio below 1 is refused by the schema, since the request would exceed the limit. Regenerated with cozyvalues-gen v1.7.0 and controller-gen v0.16.4; one helm unittest suite per application covers the default, a set ratio and the refusal (Valkey's first unit tests). Assisted-by: LLM Signed-off-by: Yasar Rahman <[email protected]> (cherry picked from commit c429907)

yrahman82 · 2026-11-06T15:32:24Z

Superseded by #5241: rebased onto current main and extended to Redis, Valkey, RabbitMQ, NATS and Kafka (same resourcesAllocationRatio, one commit on top of the two from here). Closing this one so there is a single PR to review.

yrahman82 requested review from IvanHunters, Andrei Kvapil (kvaps), Aleksei Sviridkin (lexfrei), Timofei Larkin (lllamnyp), Matthieu ROBIN (matthieu-robin), myasnikovdaniil and scooby87 as code owners October 13, 2026 18:17

github-actions Bot added area/database Issues or PRs related to managed databases (postgres, mariadb, redis, etcd, kafka, clickhouse) kind/feature Categorizes issue or PR as related to a new feature size/L This PR changes 100-499 lines, ignoring generated files labels Oct 13, 2026

coderabbitai Bot reviewed Oct 13, 2026

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Comment thread api/apps/v1alpha1/postgresql/types.go Resolved

yrahman82 mentioned this pull request Nov 6, 2026

feat(apps): per-application allocation ratio for Postgres, Redis, Valkey, RabbitMQ, NATS and Kafka #5241

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yrahman82 closed this Nov 6, 2026

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feat(postgres): per-application allocation ratio (resourcesAllocationRatio) - #4907

feat(postgres): per-application allocation ratio (resourcesAllocationRatio)#4907
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What this PR does

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