Add scaling support

[galt-tr]

This pull request introduces Kubernetes Horizontal Pod Autoscaler (HPA) and scaling support for the custom resources Asset, Propagation, and SubtreeValidator. It enhances their CRDs and controllers to support the /scale subresource, exposes replica and selector status fields, and improves usability with extra status columns and better error handling. Additionally, it standardizes default replica counts across various deployment specs and improves sample manifests.

Kubernetes scaling and CRD enhancements:

• Added replicas and selector status fields to the AssetStatus, PropagationStatus, and SubtreeValidatorStatus structs, and enabled the /scale subresource in their CRDs, allowing native Kubernetes scaling and HPA support. [1] [2] [3] [4] [5] [6]
• Enhanced the Propagation CRD with additional printer columns for desired/current replicas, ready status, and age to improve kubectl get usability.

Controller and operator improvements:

• Updated the AssetReconciler to synchronize replica and selector status from the underlying deployment, and to requeue reconciliation if the desired and actual replica counts differ, ensuring accurate scaling status reporting. [1] [2]
• Added event filtering to the AssetReconciler to only trigger reconciliations on generation changes, reducing unnecessary reconciles.
• Improved error handling in the BlockchainReconciler to detect and gracefully handle connection errors when running out-of-cluster, avoiding aggressive requeues. [1] [2]

Deployment spec standardization:

• Standardized the default number of replicas for Asset, BlockAssembly, Blockchain, BlockPersister, and BlockValidator deployments by referencing new constants, improving consistency and configurability. [1] [2] [3] [4] [5] [6] [7]

Sample and configuration updates:

• Updated the sample Propagation manifest to include resource requests/limits and replica fields, aligning it with the new scaling capabilities.

Operator initialization and scheme registration:

• Refactored scheme registration in main.go to explicitly add necessary API schemes and changed the default health probe port. [1] [2] [3] [4] [5]

[github-actions]

👋 Thanks, @galt-tr!

This pull request comes from a fork. For security, our CI runs in a restricted mode.
A maintainer will triage this shortly and run any additional checks as needed.

• 🏷️ Labeled: fork-pr, requires-manual-review
• 👀 We'll review and follow up here if anything else is needed.

Thanks for contributing to bsv-blockchain/teranode-operator! 🚀

[sonarqubecloud]

Quality Gate passed

Issues
14 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud