rule-evaluator.yaml

# Copyright 2025 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

---
# Source: rule-evaluator/templates/serviceaccount.yaml
apiVersion: v1
kind: ServiceAccount
metadata:
  name: rule-evaluator
---
# Source: rule-evaluator/templates/configmaps.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: rule-evaluator
  labels:
    app.kubernetes.io/name: rule-evaluator
data:
  config.yaml: |
    global:
      external_labels: {}
      evaluation_interval: 60s

    rule_files:
    - "/etc/rules/*.yaml"
---
# Source: rule-evaluator/templates/configmaps.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: rules
  labels:
    app.kubernetes.io/name: rule-evaluator
data:
  rules.yaml: |
    groups:
    - name: example
      interval: 10s
      rules:
      - record: job:up:sum
        expr: sum without(instance) (up)
      - alert: AlwaysFiring
        expr: vector(1)
---
# Source: rule-evaluator/templates/role.yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: rule-evaluator
rules:
- resources:
  - endpoints
  - nodes
  - nodes/metrics
  - pods
  - services
  apiGroups: [""]
  verbs: ["get", "list", "watch"]
- resources:
  - configmaps
  apiGroups: [""]
  verbs: ["get"]
- nonResourceURLs: ["/metrics"]
  verbs: ["get"]
---
# Source: rule-evaluator/templates/rolebinding.yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: rule-evaluator
roleRef:
  name: rule-evaluator
  kind: ClusterRole
  apiGroup: rbac.authorization.k8s.io
subjects:
- name: rule-evaluator
  namespace: default
  kind: ServiceAccount
---
# Source: rule-evaluator/templates/service.yaml
apiVersion: v1
kind: Service
metadata:
  name: rule-evaluator
  labels:
    app.kubernetes.io/name: rule-evaluator
spec:
  selector:
      app.kubernetes.io/name: rule-evaluator
  ports:
    - name: rule-evaluator
      port: 9092
      targetPort: 9092
---
# Source: rule-evaluator/templates/deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: rule-evaluator
  labels:
    app.kubernetes.io/name: rule-evaluator
spec:
  selector:
    matchLabels:
      app.kubernetes.io/name: rule-evaluator
  template:
    metadata:
      labels:
        app.kubernetes.io/name: rule-evaluator
        app.kubernetes.io/version: 0.15.4
    spec:
      serviceAccountName: rule-evaluator
      automountServiceAccountToken: true
      initContainers:
      - name: config-init
        image: gke.gcr.io/gke-distroless/bash:gke_distroless_20250407.00_p0
        command: ['/bin/bash', '-c', 'touch /prometheus/config_out/config.yaml']
        volumeMounts:
        - name: config-out
          mountPath: /prometheus/config_out
      containers:
      - name: evaluator
        image: gke.gcr.io/prometheus-engine/rule-evaluator:v0.15.4-gke.0
        args:
        - "--config.file=/prometheus/config_out/config.yaml"
        - "--web.listen-address=:9092"
        ports:
        - name: r-eval-metrics
          containerPort: 9092
        resources:
          limits:
            memory: 1G
          requests:
            cpu: 1m
            memory: 16M
        volumeMounts:
        - name: config-out
          readOnly: true
          mountPath: /prometheus/config_out
        - name: rules-out
          readOnly: true
          mountPath: /etc/rules
        livenessProbe:
          httpGet:
            port: r-eval-metrics
            path: /-/healthy
        readinessProbe:
          httpGet:
            port: r-eval-metrics
            path: /-/ready
          # Readiness attempts a query round-trip so we need a more generous timeout.
          timeoutSeconds: 5
        securityContext:
          allowPrivilegeEscalation: false
          capabilities:
            drop:
            - all
          privileged: false
          readOnlyRootFilesystem: true
      - name: config-reloader
        image: gke.gcr.io/prometheus-engine/config-reloader:v0.15.4-gke.0
        args:
        - --config-file=/prometheus/config/config.yaml
        - --config-file-output=/prometheus/config_out/config.yaml
        - --config-dir=/etc/rules
        - --config-dir-output=/prometheus/rules_out
        - --reload-url=http://127.0.0.1:9092/-/reload
        - --ready-url=http://127.0.0.1:9092/-/ready
        - --listen-address=:9093
        ports:
        - name: cfg-rel-metrics
          protocol: TCP
          containerPort: 9093
        resources:
          limits:
            memory: 32M
          requests:
            cpu: 1m
            memory: 4M
        volumeMounts:
        - name: config
          readOnly: true
          mountPath: /prometheus/config
        - name: config-out
          mountPath: /prometheus/config_out
        - name: rules
          readOnly: true
          mountPath: /etc/rules
        - name: rules-out
          mountPath: /prometheus/rules_out
        securityContext:
          allowPrivilegeEscalation: false
          capabilities:
            drop:
            - all
          privileged: false
          readOnlyRootFilesystem: true
      volumes:
      - name: config
        configMap:
          name: rule-evaluator
      - name: config-out
        emptyDir: {}
      - name: rules
        # Mount exactly one ConfigMap per rule type (3 total)
        # - rules: namespace-scoped Rules
        # - clusterrules: cluster-scoped ClusterRules
        # - globalrules: GlobalRules
        projected:
          sources:
          - configMap:
              name: rules
              optional: true
          - configMap:
              name: clusterrules
              optional: true
          - configMap:
              name: globalrules
              optional: true
      - name: rules-out
        emptyDir: {}
      affinity:
        nodeAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            nodeSelectorTerms:
            - matchExpressions:
              - key: kubernetes.io/arch
                operator: In
                values:
                - arm64
                - amd64
              - key: kubernetes.io/os
                operator: In
                values:
                - linux
      tolerations:
      - key: "components.gke.io/gke-managed-components"
        operator: "Exists"
      - value: "amd64"
        effect: "NoSchedule"
        key: "kubernetes.io/arch"
        operator: "Equal"
      - value: "arm64"
        effect: "NoSchedule"
        key: "kubernetes.io/arch"
        operator: "Equal"
      securityContext:
        runAsGroup: 1000
        runAsNonRoot: true
        runAsUser: 1000
        seccompProfile:
          type: RuntimeDefault