Add node hang instrumentation and scale down chromium services
- Add journald collection to Alloy (loki.source.journal) for kernel OOM,
panic, hung task, and soft lockup detection — ships system logs off-node
so they survive hard resets
- Add 5 Loki alerting rules (KernelOOMKiller, KernelPanic, KernelHungTask,
KernelSoftLockup, ContainerdDown) evaluating against node-journal logs
- Fix Loki ruler config: correct rules mount path (/var/loki/rules/fake),
add alertmanager_url and enable_api
- Add Prometheus alerts: NodeMemoryPressureTrending (>85%), NodeExporterDown,
NodeHighIOWait (>30%)
- Add caretta tolerations for control-plane and GPU nodes
- Scale down chromium-based services to 0 for cluster stability:
f1-stream, flaresolverr, changedetection, resume/printer
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