Add kpod-metrics

[pjs7678]

kpod-metrics is an eBPF-based pod-level kernel metrics collector for Kubernetes.

• Exports 50+ per-pod metrics (CPU, network, memory, syscalls, disk I/O, L7 protocols) to Prometheus
• Auto-discovered service topology from TCP peer data
• BPF programs defined using a Kotlin DSL instead of C
• Supports kernel 4.18+ (legacy) and 5.2+ (CO-RE)
• ~256 Mi memory per node, tested up to 1,000 nodes / 100,000 pods

Added to the Observability section.

[qmonnet]

Looks good, thank you!