# Tetragon Agent DaemonSet for Stella Ops
# Sprint: SPRINT_20260118_019_Infra_tetragon_integration
# Task: TASK-019-007 - Create Kubernetes deployment extending existing manifests
#
# Deploys the Stella Ops Tetragon agent alongside the existing agent framework.
# Follows existing DaemonSet patterns from devops/helm/

apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: stella-ops-tetragon-agent
  namespace: stella-ops
  labels:
    app.kubernetes.io/name: stella-ops-tetragon-agent
    app.kubernetes.io/component: runtime-instrumentation
    app.kubernetes.io/part-of: stella-ops
spec:
  selector:
    matchLabels:
      app.kubernetes.io/name: stella-ops-tetragon-agent
  updateStrategy:
    type: RollingUpdate
    rollingUpdate:
      maxUnavailable: 1
  template:
    metadata:
      labels:
        app.kubernetes.io/name: stella-ops-tetragon-agent
        app.kubernetes.io/component: runtime-instrumentation
      annotations:
        prometheus.io/scrape: "true"
        prometheus.io/port: "8080"
        prometheus.io/path: "/metrics"
    spec:
      serviceAccountName: stella-ops-tetragon-agent
      hostPID: true
      hostNetwork: false
      tolerations:
        - key: node-role.kubernetes.io/master
          effect: NoSchedule
        - key: node-role.kubernetes.io/control-plane
          effect: NoSchedule
      containers:
        - name: tetragon-agent
          image: stellaops/tetragon-agent:latest
          imagePullPolicy: IfNotPresent
          securityContext:
            privileged: true
            capabilities:
              add:
                - SYS_ADMIN
                - NET_ADMIN
                - BPF
                - PERFMON
          ports:
            - name: metrics
              containerPort: 8080
              protocol: TCP
            - name: health
              containerPort: 8081
              protocol: TCP
          env:
            - name: NODE_NAME
              valueFrom:
                fieldRef:
                  fieldPath: spec.nodeName
            - name: STELLA_API_URL
              valueFrom:
                configMapKeyRef:
                  name: stella-ops-tetragon-config
                  key: api-url
            - name: STELLA_AGENT_ID
              valueFrom:
                fieldRef:
                  fieldPath: metadata.name
            - name: TETRAGON_GRPC_ADDRESS
              value: "localhost:54321"
            - name: LOG_LEVEL
              valueFrom:
                configMapKeyRef:
                  name: stella-ops-tetragon-config
                  key: log-level
                  optional: true
          volumeMounts:
            - name: tetragon-config
              mountPath: /etc/tetragon
              readOnly: true
            - name: agent-certs
              mountPath: /etc/stella-ops/certs
              readOnly: true
            - name: bpf
              mountPath: /sys/fs/bpf
            - name: proc
              mountPath: /host/proc
              readOnly: true
          resources:
            requests:
              cpu: 100m
              memory: 128Mi
            limits:
              cpu: 500m
              memory: 512Mi
          livenessProbe:
            httpGet:
              path: /healthz
              port: 8081
            initialDelaySeconds: 10
            periodSeconds: 30
          readinessProbe:
            httpGet:
              path: /ready
              port: 8081
            initialDelaySeconds: 5
            periodSeconds: 10
      volumes:
        - name: tetragon-config
          configMap:
            name: stella-ops-tetragon-policy
        - name: agent-certs
          secret:
            secretName: stella-ops-agent-certs
            optional: true
        - name: bpf
          hostPath:
            path: /sys/fs/bpf
            type: DirectoryOrCreate
        - name: proc
          hostPath:
            path: /proc
            type: Directory
---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: stella-ops-tetragon-agent
  namespace: stella-ops
  labels:
    app.kubernetes.io/name: stella-ops-tetragon-agent
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: stella-ops-tetragon-agent
  labels:
    app.kubernetes.io/name: stella-ops-tetragon-agent
rules:
  # Read pods for container correlation
  - apiGroups: [""]
    resources: ["pods", "namespaces"]
    verbs: ["get", "list", "watch"]
  # Read nodes for host information
  - apiGroups: [""]
    resources: ["nodes"]
    verbs: ["get", "list"]
  # Read Tetragon CRDs
  - apiGroups: ["cilium.io"]
    resources: ["tracingpolicies", "tracingpoliciesnamespaced"]
    verbs: ["get", "list", "watch"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: stella-ops-tetragon-agent
  labels:
    app.kubernetes.io/name: stella-ops-tetragon-agent
subjects:
  - kind: ServiceAccount
    name: stella-ops-tetragon-agent
    namespace: stella-ops
roleRef:
  kind: ClusterRole
  name: stella-ops-tetragon-agent
  apiGroup: rbac.authorization.k8s.io
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: stella-ops-tetragon-config
  namespace: stella-ops
  labels:
    app.kubernetes.io/name: stella-ops-tetragon-agent
data:
  api-url: "http://stella-ops-signals.stella-ops.svc.cluster.local:8080"
  log-level: "info"
  aggregation-window: "60s"
  buffer-size: "10000"
  min-confidence: "0.5"
  # Privacy settings
  redact-arguments: "true"
  symbol-id-only-mode: "false"
  # Allowed namespaces (comma-separated, empty = all)
  allowed-namespaces: "stella-ops-workloads,default"
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: stella-ops-tetragon-policy
  namespace: stella-ops
  labels:
    app.kubernetes.io/name: stella-ops-tetragon-agent
data:
  policy.yaml: |
    # Reference the TracingPolicy defined in stella-ops-tracing-policy.yaml
    # This ConfigMap can contain additional local policy configurations
    policyRef: stella-ops-runtime-capture
    enableStackTraces: true
    stackTraceSize: 16
    filterNamespaces:
      - stella-ops-workloads
---
apiVersion: v1
kind: Service
metadata:
  name: stella-ops-tetragon-agent
  namespace: stella-ops
  labels:
    app.kubernetes.io/name: stella-ops-tetragon-agent
spec:
  type: ClusterIP
  clusterIP: None  # Headless for DaemonSet
  ports:
    - name: metrics
      port: 8080
      targetPort: metrics
    - name: health
      port: 8081
      targetPort: health
  selector:
    app.kubernetes.io/name: stella-ops-tetragon-agent
---
# ServiceMonitor for Prometheus Operator (optional)
apiVersion: monitoring.coreos.com/v1
kind: ServiceMonitor
metadata:
  name: stella-ops-tetragon-agent
  namespace: stella-ops
  labels:
    app.kubernetes.io/name: stella-ops-tetragon-agent
spec:
  selector:
    matchLabels:
      app.kubernetes.io/name: stella-ops-tetragon-agent
  endpoints:
    - port: metrics
      interval: 30s
      path: /metrics