What you would like to be added?

Add comprehensive scale testing infrastructure for Grove operator including:

• KWOK/Kubemark cluster setup: Automated deployment of simulated node clusters (1000+ nodes)
• Observability integration: Prometheus metrics collection, pprof profiling, optional Pyroscope continuous profiling
• Performance baseline tracking: Store and compare metrics across versions with regression detection
• CI integration: Automated nightly scale tests with benchstat comparison

Why is this needed?

Grove orchestrates complex multi-node workloads with multi-layer gang scheduling (PodGangSet → ScalingGroup → PodClique → Pods). To ensure reliable operation at scale:

1. Validate performance characteristics: Understand operator behavior with 100-10k+ pods
2. Detect regressions: Automatically track performance metrics (reconciliation latency, memory usage, throughput) across git commits
3. Identify bottlenecks: Profile operator under load to optimize critical code paths (cascade sync, gang coordination, topology evaluation)
4. Build confidence: Demonstrate Grove handles production workloads at scale before customers deploy