# services/maintenance/metis-sentinel-daemonset.yaml
apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: metis-sentinel
  namespace: maintenance
spec:
  selector:
    matchLabels:
      app: metis-sentinel
  updateStrategy:
    type: RollingUpdate
  template:
    metadata:
      labels:
        app: metis-sentinel
      annotations:
        prometheus.io/scrape: "true"
        prometheus.io/port: "8080"
        prometheus.io/path: "/metrics"
    spec:
      serviceAccountName: metis
      nodeSelector:
        kubernetes.io/os: linux
        node-role.kubernetes.io/worker: "true"
      containers:
        - name: metis-sentinel
          image: registry.bstein.dev/bstein/metis-sentinel:latest
          imagePullPolicy: Always
          command:
            - /bin/sh
            - -c
          args:
            - |
              set -eu
              out_dir="${METIS_SENTINEL_OUT:-/var/run/metis-sentinel}"
              interval="${METIS_SENTINEL_INTERVAL_SEC:-120}"
              mkdir -p "${out_dir}"
              while true; do
                ts="$(date -u +%Y%m%dT%H%M%SZ)"
                node="${METIS_SENTINEL_NODE:-unknown}"
                tmp="${out_dir}/${node}-${ts}.json.tmp"
                out="${out_dir}/${node}-${ts}.json"
                if metis-sentinel > "${tmp}"; then
                  mv "${tmp}" "${out}"
                else
                  rm -f "${tmp}" || true
                fi
                sleep "${interval}"
              done
          envFrom:
            - configMapRef:
                name: metis
          env:
            - name: METIS_SENTINEL_NODE
              valueFrom:
                fieldRef:
                  fieldPath: spec.nodeName
          ports:
            - name: http
              containerPort: 8080
          volumeMounts:
            - name: sentinel-output
              mountPath: /var/run/metis-sentinel
          resources:
            requests:
              cpu: 25m
              memory: 64Mi
            limits:
              cpu: 250m
              memory: 256Mi
          securityContext:
            allowPrivilegeEscalation: false
            runAsUser: 0
            capabilities:
              drop: ["ALL"]
        - name: sentinel-pusher
          image: curlimages/curl:8.12.1
          imagePullPolicy: IfNotPresent
          command:
            - /bin/sh
            - -c
          args:
            - |
              set -eu
              out_dir="${METIS_SENTINEL_OUT:-/var/run/metis-sentinel}"
              push_url="${METIS_SENTINEL_PUSH_URL:-}"
              interval="${METIS_SENTINEL_PUSH_INTERVAL_SEC:-120}"
              timeout="${METIS_SENTINEL_PUSH_TIMEOUT_SEC:-10}"
              mkdir -p "${out_dir}"
              while true; do
                for snapshot in "${out_dir}"/*.json; do
                  [ -f "${snapshot}" ] || continue
                  if [ -z "${push_url}" ]; then
                    break
                  fi
                  if curl -fsS --connect-timeout "${timeout}" --max-time "${timeout}" \
                    -X POST \
                    -H "Content-Type: application/json" \
                    -H "X-Metis-Node: ${METIS_SENTINEL_NODE:-unknown}" \
                    --data-binary "@${snapshot}" \
                    "${push_url}"; then
                    rm -f "${snapshot}"
                  fi
                done
                sleep "${interval}"
              done
          envFrom:
            - configMapRef:
                name: metis
          env:
            - name: METIS_SENTINEL_NODE
              valueFrom:
                fieldRef:
                  fieldPath: spec.nodeName
          volumeMounts:
            - name: sentinel-output
              mountPath: /var/run/metis-sentinel
          resources:
            requests:
              cpu: 10m
              memory: 32Mi
            limits:
              cpu: 100m
              memory: 128Mi
          securityContext:
            allowPrivilegeEscalation: false
            runAsUser: 0
            capabilities:
              drop: ["ALL"]
      volumes:
        - name: sentinel-output
          emptyDir: {}