observability: add k8s API/kubelet tracing, Alloy, Mimir and Loki
Wire kube-apiserver and kubelet tracing to a Jaeger collector on docker-29, deploy Grafana Alloy in-cluster to ship logs/metrics, and stand up Mimir + Loki on docker-30 as their backing stores. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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