Modernize Go version and all dependencies to align with Volcano v1.15 / Kubernetes 1.35

[hajnalmt]

Context

This project is frozen at early 2021 Kubernetes ecosystem standards. It currently uses:

• Go 1.15 (5+ years old, EOL)
• k8s.io/ v0.19.6* (Kubernetes 1.19, EOL since 2021)
• volcano.sh/apis v0.0.0-20210528 (5 years old)
• klog v1 (deprecated, unmaintained)
• github.com/google/cadvisor v0.37.3 (very outdated)
• github.com/golang/protobuf v1.4.3 (deprecated, replaced by google.golang.org/protobuf)

The project directly imports k8s.io/kubernetes internal packages (pkg/kubelet/cm/cpumanager/state, pkg/kubelet/cadvisor, pkg/kubelet/eviction), which is an anti-pattern explicitly discouraged by the Kubernetes project. This forces a massive 25-entry replace block in go.mod and makes upgrades extremely painful.

Target

Align with Volcano master (future v1.15) which targets Kubernetes 1.35:

Dependency	Current	Target
Go	1.15	1.25.0
k8s.io/*	v0.19.6	v0.35.0
klog	v1.0.0	klog/v2 v2.130.1
volcano.sh/apis	v0.0.0-20210528	Current Volcano APIs module
cadvisor	v0.37.3	v0.53.0
protobuf	github.com/golang/protobuf	google.golang.org/protobuf

Tasks

• Upgrade Go version in go.mod to 1.25.0
• Remove direct dependency on k8s.io/kubernetes internal packages
  • Extract or vendor only the CPU manager checkpoint parsing logic (struct + unmarshal)
  • Replace k8s.io/kubernetes/pkg/kubelet/cm/cpuset with the public k8s.io/utils/cpuset package (available since K8s 1.25+)
  • Replace cadvisor machine info initialization with a lighter approach or direct sysfs reading
  • Replace kubelet eviction threshold parsing with local implementation
• Upgrade all k8s.io/* dependencies to v0.35.0
• Migrate from klog v1 to klog/v2 (update all import paths and initialization)
• Update volcano.sh/apis to match current Volcano CRD types (Numatopology)
• Remove the replace directive block entirely
• Replace deprecated github.com/golang/protobuf with google.golang.org/protobuf
• Replace deprecated io/ioutil usage with os package equivalents
• Verify the project compiles and runs against a Kubernetes 1.35 cluster

Notes

The hardest part of this work is removing the k8s.io/kubernetes internal dependency. The project imports:

1. k8s.io/kubernetes/pkg/kubelet/cm/cpumanager/state — for checkpoint parsing (CPU allocations)
2. k8s.io/kubernetes/pkg/kubelet/cm/cpuset — for CPU set parsing (now available as k8s.io/utils/cpuset)
3. k8s.io/kubernetes/pkg/kubelet/cadvisor — for machine info (NUMA node count, memory)
4. k8s.io/kubernetes/pkg/kubelet/eviction — for eviction threshold parsing

Each of these needs to be replaced with either a public API, a vendored minimal copy, or a reimplementation.

Priority

Critical — the project cannot compile with any modern Go toolchain or target any supported Kubernetes version in its current state.