Aleksei Sviridkin
8ed34166cf
## What this PR does The lineage mutating webhook walks the owner chain (Pod, StatefulSet, HelmRelease, application CR) on every admission, with one uncached dynamic GET per level, and sibling Pods of the same parent repeat the same lookups. On a multi-tenant cluster this put `lineage.cozystack.io` at 300-500ms p99 in `apiserver_admission_webhook_admission_duration_seconds`, the largest share of admission latency. Owners are now cached in-process for 60 seconds, and only successful lookups are stored. A failed lookup (RESTMapping, NotFound, timeout) leaves the walk without an owner, so the object is admitted with no lineage labels and stays unlabeled until its next UPDATE runs the walk again. Secrets, Services and PVCs can go a long time between updates, so a cached failure would leave every object admitted within the TTL unlabeled for that long. The aggregated cozystack-api makes such failures routine, since discovery of `apps.cozystack.io` fails while it rolls. The one staleness left is the scheduling class, which is read from the application's spec: a change to it reaches newly admitted Pods up to 60 seconds later. The cache is not swept below 4096 entries, so up to that many owner objects stay in memory for the life of the process. Above that, each insert drops the expired entries among a random sample of 64, which keeps the write lock short. Non-Pod objects that already carry every lineage label, `internal.cozystack.io/tenantresource` included, skip the walk, because the objectSelector still matches an UPDATE whose old object lacks the label. Pods go through regardless, as each Pod admission also sets the scheduling class. ### Screenshots Not a UI change. ### Downstream repositories The diff is Go under `pkg/lineage` and `internal/lineagecontrollerwebhook` only: no label, annotation, CRD, values key, `hack/` file or telemetry metric is added or renamed, so no entry of the trigger map applies. - [x] No downstream repository is affected by this change - [ ] [cozystack/website](https://github.com/cozystack/website) - follow-up: - [ ] [cozystack/terraform-provider-cozystack](https://github.com/cozystack/terraform-provider-cozystack) - follow-up: - [ ] [cozystack/ansible-cozystack](https://github.com/cozystack/ansible-cozystack) - follow-up: - [ ] [cozystack/ccp](https://github.com/cozystack/ccp) - follow-up: - [ ] [cozystack/talm](https://github.com/cozystack/talm) - follow-up: - [ ] [cozystack/cozyhr](https://github.com/cozystack/cozyhr) - follow-up: - [ ] [cozystack/cozy-proxy](https://github.com/cozystack/cozy-proxy) - follow-up: - [ ] [cozystack/cozystack-telemetry-server](https://github.com/cozystack/cozystack-telemetry-server) - follow-up: - [ ] [cozystack/external-apps-example](https://github.com/cozystack/external-apps-example) - follow-up: - [ ] [cozystack/examples](https://github.com/cozystack/examples) - follow-up: - [ ] [cozystack/community](https://github.com/cozystack/community) - follow-up: ### Release note ```release-note perf(lineage): the lineage mutating webhook caches owner lookups for 60 seconds and skips the owner walk for non-Pod objects that already carry lineage labels, cutting admission latency on clusters with many tenants. ``` <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit * **New Features** * Lineage and owner lookups now use a time-limited in-memory cache, reducing repeated API requests during admission processing. Scheduling-class updates may take up to 60 seconds to appear on new Pods. * Non-Pod objects with complete lineage labels are allowed without additional owner lookup or mutation. * **Tests** * Added coverage for cache hits, misses, expiration, and retrying lookups after errors. <!-- end of auto-generated comment: release notes by coderabbit.ai -->
Cozystack
Cozystack is a free and open-source platform and framework for building clouds.
Cozystack is a CNCF Sandbox project that was originally built and sponsored by Ænix.
With Cozystack, you can transform a bunch of servers into an intelligent system with a simple REST API for spawning Kubernetes clusters, Database-as-a-Service, virtual machines, load balancers, HTTP caching services, and other services with ease.
Use Cozystack to build your own cloud or provide a cost-effective development environment.
Use-Cases
-
Using Cozystack to build a public cloud
You can use Cozystack as a backend for a public cloud -
Using Cozystack to build a private cloud
You can use Cozystack as a platform to build a private cloud powered by Infrastructure-as-Code approach -
Using Cozystack as a Kubernetes distribution
You can use Cozystack as a Kubernetes distribution for Bare Metal
Documentation
The documentation is located on the cozystack.io website.
Read the Getting Started section for a quick start.
If you encounter any difficulties, start with the troubleshooting guide and work your way through the process that we've outlined.
Versioning
Versioning adheres to the Semantic Versioning principles.
A full list of the available releases is available in the GitHub repository's Release section.
Contributions
Contributions are highly appreciated and very welcomed!
In case of bugs, please check if the issue has already been opened by checking the GitHub Issues section. If it isn't, you can open a new one. A detailed report will help us replicate it, assess it, and work on a fix.
You are welcome to take on the fix yourself. Commits are used to generate the changelog, and their author will be referenced in it.
If you have a concrete feature request, open an issue. For a cross-cutting or architectural change, open a design proposal in the community repo. For questions or early ideas, use GitHub Discussions. See CONTRIBUTING.md for the full routing.
Community
You are welcome to join us in #cozystack, on either CNCF Slack (get an invite) or Kubernetes Slack (get an invite), in our Telegram group, and at our community meetings. Add them to your Google Calendar or iCal for convenience.
Project documents
| Document | What it covers |
|---|---|
| Governance | How decisions are made and who makes them |
| Contributor Ladder | How to grow from contributor to maintainer |
| Maintainers | Who maintains the project |
| Code of Conduct | What we expect of each other |
| Security Policy | Reporting a vulnerability, and which releases get fixes |
| Adopters | Who runs Cozystack in production |
| Roadmap | Where the project is going |
License
Cozystack is licensed under Apache 2.0.
The code is provided as-is with no warranties.
Commercial Support
A list of companies providing commercial support for this project can be found on official site.