feat(observability): ship pod logs to Loki via Grafana Alloy

Adds a Grafana Alloy DaemonSet that tails honeydue-namespace pod logs
from /var/log/pods and pushes them to Loki at obs.88oakapps.com,
reusing the existing OBS_INGEST_TOKEN (14-day retention).

- deploy-k3s/manifests/observability/alloy-logs.yaml — DaemonSet + RBAC
  + token Secret + Alloy config. Runs as root (/var/log/pods is 0750
  root:root) but otherwise locked down: all caps dropped, read-only
  root filesystem, seccomp RuntimeDefault, read-only hostPath mount.
- network-policies.yaml — allow-egress-from-alloy-logs (DNS + k8s API
  + obs HTTPS), mirroring the vmagent egress policy.
- 03-deploy.sh — applies alloy-logs with the OBS_INGEST_TOKEN
  substitution and waits for the DaemonSet rollout.

The Loki container, nginx /loki/api/v1/push route, and Grafana Loki
datasource live on the obs server and are not repo-managed.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

deploy-k3s/manifests/network-policies.yaml

@@ -372,3 +372,57 @@ spec:
       ports:
         - port: 8000
           protocol: TCP
+
+---
+# alloy-logs egress — Grafana Alloy discovers honeydue pods via the k8s API
+# and pushes their logs to Loki at obs.88oakapps.com. Same k3s NetworkPolicy
+# DNAT gotcha as vmagent: API-server traffic is policy-checked as
+# dst=<node_public_ip>:6443, so an explicit :6443 rule is required.
+# Alloy reads log FILES from a hostPath, so it needs no ingress and no
+# egress to pod :8000/:8080 — only DNS, the API server, and obs HTTPS.
+apiVersion: networking.k8s.io/v1
+kind: NetworkPolicy
+metadata:
+  name: allow-egress-from-alloy-logs
+  namespace: honeydue
+spec:
+  podSelector:
+    matchLabels:
+      app.kubernetes.io/name: alloy-logs
+  policyTypes:
+    - Egress
+  egress:
+    # DNS (cluster-internal)
+    - to:
+        - namespaceSelector: {}
+      ports:
+        - port: 53
+          protocol: UDP
+        - port: 53
+          protocol: TCP
+    # k8s API server via ClusterIP (pre-DNAT view)
+    - to:
+        - ipBlock:
+            cidr: 10.43.0.0/16
+      ports:
+        - port: 443
+          protocol: TCP
+    # k8s API server post-DNAT (real path k3s NetPol enforcer sees) — REQUIRED
+    - to:
+        - ipBlock:
+            cidr: 0.0.0.0/0
+            except:
+              - 10.42.0.0/16
+      ports:
+        - port: 6443
+          protocol: TCP
+    # HTTPS to public (log push to obs.88oakapps.com via Cloudflare)
+    - to:
+        - ipBlock:
+            cidr: 0.0.0.0/0
+            except:
+              - 10.42.0.0/16
+              - 10.43.0.0/16
+      ports:
+        - port: 443
+          protocol: TCP

deploy-k3s/manifests/observability/alloy-logs.yaml

@@ -0,0 +1,257 @@
+# honeyDue log shipper — Grafana Alloy as a DaemonSet.
+#
+# Each node runs one Alloy pod that tails the honeydue-namespace pod logs in
+# /var/log/pods and pushes them to Loki at obs.88oakapps.com/loki/api/v1/push
+# (the same nginx ingest endpoint + bearer token vmagent uses for metrics).
+#
+# Runs as root: /var/log/pods is 0750 root:root on the k3s nodes, so a
+# non-root uid cannot even traverse it. The container is otherwise locked
+# down — all capabilities dropped, read-only root filesystem, seccomp
+# RuntimeDefault — and root inside the container reads only a read-only
+# hostPath mount of /var/log/pods. This is the one root-running workload in
+# the namespace (standard for log collectors); see docs/deployment.
+#
+# 03-deploy.sh substitutes TOKEN_PLACEHOLDER with OBS_INGEST_TOKEN from
+# deploy/prod.env before applying — the token never lands in the repo.
+---
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: alloy-logs
+  namespace: honeydue
+  labels:
+    app.kubernetes.io/name: alloy-logs
+    app.kubernetes.io/part-of: honeydue
+---
+# Least privilege: Alloy's discovery.kubernetes only lists/watches pods, and
+# only in the honeydue namespace — so a namespaced Role, not a ClusterRole.
+apiVersion: rbac.authorization.k8s.io/v1
+kind: Role
+metadata:
+  name: alloy-logs
+  namespace: honeydue
+  labels:
+    app.kubernetes.io/name: alloy-logs
+    app.kubernetes.io/part-of: honeydue
+rules:
+  - apiGroups: [""]
+    resources: ["pods"]
+    verbs: ["get", "list", "watch"]
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: RoleBinding
+metadata:
+  name: alloy-logs
+  namespace: honeydue
+  labels:
+    app.kubernetes.io/name: alloy-logs
+    app.kubernetes.io/part-of: honeydue
+subjects:
+  - kind: ServiceAccount
+    name: alloy-logs
+    namespace: honeydue
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: Role
+  name: alloy-logs
+---
+# Bearer token for the Loki push endpoint. TOKEN_PLACEHOLDER is replaced by
+# 03-deploy.sh with OBS_INGEST_TOKEN (same token vmagent uses).
+apiVersion: v1
+kind: Secret
+metadata:
+  name: alloy-logs-auth
+  namespace: honeydue
+  labels:
+    app.kubernetes.io/name: alloy-logs
+    app.kubernetes.io/part-of: honeydue
+type: Opaque
+stringData:
+  bearer_token: TOKEN_PLACEHOLDER
+---
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: alloy-logs
+  namespace: honeydue
+  labels:
+    app.kubernetes.io/name: alloy-logs
+    app.kubernetes.io/part-of: honeydue
+data:
+  config.alloy: |
+    // honeyDue log shipper. Each DaemonSet instance discovers honeydue-namespace
+    // pods via the Kubernetes API, tails the container log files present on its
+    // own node (/var/log/pods), and pushes them to Loki at obs.88oakapps.com.
+
+    logging {
+      level  = "warn"
+      format = "logfmt"
+    }
+
+    discovery.kubernetes "pods" {
+      role = "pod"
+      namespaces {
+        names = ["honeydue"]
+      }
+    }
+
+    // Turn pod metadata into Loki labels and build the on-disk log path.
+    discovery.relabel "pod_logs" {
+      targets = discovery.kubernetes.pods.targets
+
+      rule {
+        source_labels = ["__meta_kubernetes_namespace"]
+        action        = "replace"
+        target_label  = "namespace"
+      }
+      rule {
+        source_labels = ["__meta_kubernetes_pod_name"]
+        action        = "replace"
+        target_label  = "pod"
+      }
+      rule {
+        source_labels = ["__meta_kubernetes_pod_container_name"]
+        action        = "replace"
+        target_label  = "container"
+      }
+      rule {
+        source_labels = ["__meta_kubernetes_pod_label_app_kubernetes_io_name"]
+        action        = "replace"
+        target_label  = "app"
+      }
+      rule {
+        source_labels = ["__meta_kubernetes_pod_node_name"]
+        action        = "replace"
+        target_label  = "node"
+      }
+      // /var/log/pods/<namespace>_<pod>_<uid>/<container>/<n>.log
+      rule {
+        source_labels = ["__meta_kubernetes_pod_uid", "__meta_kubernetes_pod_container_name"]
+        separator     = "/"
+        action        = "replace"
+        replacement   = "/var/log/pods/*$1/*.log"
+        target_label  = "__path__"
+      }
+    }
+
+    local.file_match "pod_logs" {
+      path_targets = discovery.relabel.pod_logs.output
+    }
+
+    loki.source.file "pod_logs" {
+      targets    = local.file_match.pod_logs.targets
+      forward_to = [loki.process.pod_logs.receiver]
+    }
+
+    // Parse the CRI log format (timestamp / stream / flags / message).
+    loki.process "pod_logs" {
+      forward_to = [loki.write.obs.receiver]
+
+      stage.cri {}
+    }
+
+    loki.write "obs" {
+      endpoint {
+        url               = "https://obs.88oakapps.com/loki/api/v1/push"
+        bearer_token_file = "/etc/alloy-secrets/bearer_token"
+      }
+      external_labels = {
+        cluster     = "honeydue-k3s",
+        environment = "prod",
+      }
+    }
+---
+apiVersion: apps/v1
+kind: DaemonSet
+metadata:
+  name: alloy-logs
+  namespace: honeydue
+  labels:
+    app.kubernetes.io/name: alloy-logs
+    app.kubernetes.io/part-of: honeydue
+spec:
+  selector:
+    matchLabels:
+      app.kubernetes.io/name: alloy-logs
+  updateStrategy:
+    type: RollingUpdate
+    rollingUpdate:
+      maxUnavailable: 1
+  template:
+    metadata:
+      labels:
+        app.kubernetes.io/name: alloy-logs
+        app.kubernetes.io/part-of: honeydue
+    spec:
+      serviceAccountName: alloy-logs
+      # Alloy needs its SA token — discovery.kubernetes talks to the API server.
+      automountServiceAccountToken: true
+      # Root is required to traverse /var/log/pods (0750 root:root). The
+      # container is otherwise fully confined (see container securityContext).
+      securityContext:
+        runAsUser: 0
+        runAsGroup: 0
+        seccompProfile:
+          type: RuntimeDefault
+      tolerations:
+        # DaemonSet must run on every node, including any control-plane taint.
+        - key: node-role.kubernetes.io/control-plane
+          operator: Exists
+          effect: NoSchedule
+      containers:
+        - name: alloy
+          image: grafana/alloy:v1.5.1@sha256:01a63f4e032ce54ee94b22049bc27f597e74f85566478c377f4b5c7f020c1eb3
+          imagePullPolicy: IfNotPresent
+          args:
+            - run
+            - /etc/alloy/config.alloy
+            - --storage.path=/tmp/alloy
+            - --server.http.listen-addr=0.0.0.0:12345
+          ports:
+            - name: http
+              containerPort: 12345
+          securityContext:
+            allowPrivilegeEscalation: false
+            readOnlyRootFilesystem: true
+            capabilities:
+              drop: ["ALL"]
+          volumeMounts:
+            - name: config
+              mountPath: /etc/alloy
+              readOnly: true
+            - name: auth
+              mountPath: /etc/alloy-secrets
+              readOnly: true
+            - name: varlogpods
+              mountPath: /var/log/pods
+              readOnly: true
+            - name: tmp
+              mountPath: /tmp/alloy
+          readinessProbe:
+            httpGet:
+              path: /-/ready
+              port: 12345
+            initialDelaySeconds: 10
+            periodSeconds: 20
+          resources:
+            requests:
+              cpu: 25m
+              memory: 64Mi
+            limits:
+              cpu: 150m
+              memory: 256Mi
+      volumes:
+        - name: config
+          configMap:
+            name: alloy-logs
+        - name: auth
+          secret:
+            secretName: alloy-logs-auth
+            defaultMode: 0400
+        - name: varlogpods
+          hostPath:
+            path: /var/log/pods
+            type: Directory
+        - name: tmp
+          emptyDir:
+            sizeLimit: 256Mi