Update kube-prometheus-stack values.yaml to clarify Loki datasource configuration and enhance observability documentation in CLUSTER-BUILD.md. Include deployment instructions for Loki and Fluent Bit, and mark tasks related to Grafana integration as completed.

clusters/noble/apps/fluent-bit/values.yaml

@@ -0,0 +1,40 @@
+# Fluent Bit — noble lab (DaemonSet; ship Kubernetes container logs to Loki gateway).
+#
+# Chart: fluent/fluent-bit — pin version on install (e.g. 0.56.0).
+# Install **after** Loki so `loki-gateway.loki.svc` exists.
+#
+# Talos: only **tail** `/var/log/containers` (no host **systemd** input — journal layout differs from typical Linux).
+#
+# kubectl apply -f clusters/noble/apps/fluent-bit/namespace.yaml
+# helm repo add fluent https://fluent.github.io/helm-charts
+# helm repo update
+# helm upgrade --install fluent-bit fluent/fluent-bit -n logging \
+#   --version 0.56.0 -f clusters/noble/apps/fluent-bit/values.yaml --wait --timeout 15m
+
+config:
+  inputs: |
+    [INPUT]
+        Name tail
+        Path /var/log/containers/*.log
+        multiline.parser docker, cri
+        Tag kube.*
+        Mem_Buf_Limit 5MB
+        Skip_Long_Lines On
+
+  filters: |
+    [FILTER]
+        Name kubernetes
+        Match kube.*
+        Merge_Log On
+        Keep_Log Off
+        K8S-Logging.Parser On
+        K8S-Logging.Exclude On
+
+  outputs: |
+    [OUTPUT]
+        Name loki
+        Match kube.*
+        Host loki-gateway.loki.svc.cluster.local
+        Port 80
+        tls Off
+        labels job=fluent-bit