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>

kubernetes-kvm-terraform/master.tf

@@ -115,6 +115,13 @@ locals {
             skip_verify = true
             override_path = true              
 
+      - path: /etc/kubernetes/tracing-config.yaml
+        content: |
+          apiVersion: apiserver.config.k8s.io/v1beta1
+          kind: TracingConfiguration
+          endpoint: 192.168.0.29:4317
+          samplingRatePerMillion: 1000000
+
       - path: /etc/kubernetes/auth-config.yaml
         content: |
           apiVersion: apiserver.config.k8s.io/v1beta1
@@ -158,6 +165,9 @@ locals {
           apiVersion: kubelet.config.k8s.io/v1beta1
           kind: KubeletConfiguration
           cgroupDriver: systemd
+          tracing:
+            endpoint: 192.168.0.29:4317
+            samplingRatePerMillion: 1000000
 
       - path: /etc/profile.d/kubectl.sh
         content: |