[bojemoi] fix(grafana): CPU Usage on Node — remplacer cpu_system par node_cpu_seconds_total

Commit 224a24e

Description

container_cpu_system_seconds_total (kernel time seulement) → proche 0 Remplacé par node_exporter node_cpu_seconds_total :

• Total: 100 - avg(idle) * 100
• User: avg(mode=user) * 100
• System: avg(mode=system) * 100 Unité: percent, min=0, max=100

Co-Authored-By: Claude Sonnet 4.6 (1M context) noreply@anthropic.com

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