monitoring: Specify resource limits

monitoring/README.md

@@ -1,15 +1,17 @@
-## Monitoring namespace
+# Monitoring namespace
 
 Prometheus is accessible at [prom.k-space.ee](https://prom.k-space.ee/)
 and the corresponding AlertManager is accessible at [am.k-space.ee](https://am.k-space.ee/).
 Both are [deployed by ArgoCD](https://argocd.k-space.ee/applications/monitoring)
 from this Git repo directory using Prometheus operator.
 
-Note that Prometheus and other monitoring stack components should appropriate
+Note that Prometheus and other monitoring stack components should use appropriate
 node selector to make sure the components get scheduled on nodes which are
 hosted in a privileged VLAN where they have access to UPS SNMP targets,
 Mikrotik router/switch API-s etc.
 
+## For users
+
 To add monitoring targets inside the Kubernetes cluster make use of
 [PodMonitor](https://github.com/prometheus-operator/prometheus-operator/blob/main/Documentation/user-guides/getting-started.md#using-podmonitors) or ServiceMonitor custom
 resource definitions.
@@ -30,6 +32,8 @@ Sample queries:
 * [Disk space left](https://prom.k-space.ee/graph?g0.range_input=1h&g0.expr=node_filesystem_avail_bytes&g0.tab=1)
 * Minio [s3 egress](https://prom.k-space.ee/graph?g0.expr=rate(minio_s3_traffic_sent_bytes%5B3m%5D)&g0.tab=0&g0.display_mode=lines&g0.show_exemplars=0&g0.range_input=6h), [internode egress](https://prom.k-space.ee/graph?g0.expr=rate(minio_inter_node_traffic_sent_bytes%5B2m%5D)&g0.tab=0&g0.display_mode=lines&g0.show_exemplars=0&g0.range_input=6h), [storage used](https://prom.k-space.ee/graph?g0.expr=minio_node_disk_used_bytes&g0.tab=0&g0.display_mode=lines&g0.show_exemplars=0&g0.range_input=6h)
 
+# For administrators
+
 To reconfigure SNMP targets etc:
 
 ```

monitoring/alertmanager.yaml

@@ -3,6 +3,7 @@ apiVersion: monitoring.coreos.com/v1alpha1
 kind: AlertmanagerConfig
 metadata:
   name: alertmanager
+  namespace: monitoring
   labels:
     app.kubernetes.io/name: alertmanager
 spec:
@@ -24,12 +25,12 @@ spec:
       apiURL:
         name: slack-secrets
         key: webhook-url
-
 ---
 apiVersion: monitoring.coreos.com/v1
 kind: Alertmanager
 metadata:
   name: alertmanager
+  namespace: monitoring
 spec:
   topologySpreadConstraints:
     - maxSkew: 1
@@ -55,6 +56,13 @@ spec:
       value: ''
       effect: NoSchedule
   replicas: 3
+  resources:
+    limits:
+      cpu: 100m
+      memory: 100Mi
+    requests:
+      cpu: 8m
+      memory: 35Mi
   serviceAccountName: alertmanager
   externalUrl: http://am.k-space.ee/
   routePrefix: "/"
@@ -68,3 +76,4 @@ apiVersion: v1
 kind: ServiceAccount
 metadata:
   name: alertmanager
+  namespace: monitoring

monitoring/prometheus.yaml

@@ -3,6 +3,7 @@ apiVersion: monitoring.coreos.com/v1
 kind: PodMonitor
 metadata:
   name: metrics
+  namespace: monitoring
 spec:
   namespaceSelector: {}
   selector: {}
@@ -14,6 +15,7 @@ apiVersion: monitoring.coreos.com/v1
 kind: Prometheus
 metadata:
   name: prometheus
+  namespace: monitoring
 spec:
   topologySpreadConstraints:
     - maxSkew: 1
@@ -53,11 +55,18 @@ spec:
   ruleNamespaceSelector: {}
   ruleSelector: {}
   retentionSize: 8GB
+  resources:
+    limits:
+      cpu: 500m
+      memory: 2Gi
+    requests:
+      cpu: 100m
+      memory: 700Mi
   storage:
     volumeClaimTemplate:
       spec:
         accessModes:
-        - ReadWriteOnce
+          - ReadWriteOnce
         resources:
           requests:
             storage: 10Gi
@@ -67,36 +76,50 @@ apiVersion: v1
 kind: ServiceAccount
 metadata:
   name: prometheus
+  namespace: monitoring
 ---
 apiVersion: rbac.authorization.k8s.io/v1
 kind: ClusterRole
 metadata:
   name: prometheus
+  namespace: monitoring
 rules:
-- apiGroups: [""]
-  resources:
-  - nodes
-  - nodes/metrics
-  - services
-  - endpoints
-  - pods
-  verbs: ["get", "list", "watch"]
-- apiGroups: [""]
-  resources:
-  - configmaps
-  verbs: ["get"]
-- apiGroups:
-  - networking.k8s.io
-  resources:
-  - ingresses
-  verbs: ["get", "list", "watch"]
-- nonResourceURLs: ["/metrics"]
-  verbs: ["get"]
+  - resources:
+      - nodes
+      - nodes/metrics
+      - services
+      - endpoints
+      - pods
+    apiGroups:
+      - ""
+    verbs:
+      - get
+      - list
+      - watch
+  - resources:
+      - configmaps
+    apiGroups:
+      - ""
+    verbs:
+      - get
+  - resources:
+      - ingresses
+    apiGroups:
+      - networking.k8s.io
+    verbs:
+      - get
+      - list
+      - watch
+  - nonResourceURLs:
+      - /metrics
+    verbs:
+      - get
 ---
 apiVersion: rbac.authorization.k8s.io/v1
 kind: ClusterRoleBinding
 metadata:
   name: prometheus
+  namespace: monitoring
 roleRef:
   apiGroup: rbac.authorization.k8s.io
   kind: ClusterRole
@@ -110,6 +133,7 @@ apiVersion: monitoring.coreos.com/v1
 kind: PrometheusRule
 metadata:
   name: prometheus
+  namespace: monitoring
 spec:
   groups:
   - name: prometheus
@@ -356,6 +380,7 @@ apiVersion: networking.k8s.io/v1
 kind: Ingress
 metadata:
   name: prometheus
+  namespace: monitoring
   annotations:
     traefik.ingress.kubernetes.io/router.entrypoints: websecure
     traefik.ingress.kubernetes.io/router.tls: "true"
@@ -381,6 +406,7 @@ apiVersion: networking.k8s.io/v1
 kind: Ingress
 metadata:
   name: alertmanager
+  namespace: monitoring
   annotations:
     traefik.ingress.kubernetes.io/router.entrypoints: websecure
     traefik.ingress.kubernetes.io/router.tls: "true"
@@ -406,6 +432,7 @@ apiVersion: monitoring.coreos.com/v1
 kind: PodMonitor
 metadata:
   name: prometheus
+  namespace: monitoring
 spec:
   selector:
     matchLabels:
@@ -417,6 +444,7 @@ apiVersion: monitoring.coreos.com/v1
 kind: PodMonitor
 metadata:
   name: alertmanager
+  namespace: monitoring
 spec:
   selector:
     matchLabels:
@@ -428,6 +456,7 @@ apiVersion: monitoring.coreos.com/v1
 kind: PodMonitor
 metadata:
   name: operator
+  namespace: monitoring
 spec:
   selector:
     matchLabels:
@@ -439,6 +468,7 @@ apiVersion: monitoring.coreos.com/v1
 kind: ServiceMonitor
 metadata:
   name: kubelet
+  namespace: monitoring
 spec:
   endpoints:
   - bearerTokenFile: /var/run/secrets/kubernetes.io/serviceaccount/token
@@ -467,6 +497,7 @@ apiVersion: codemowers.cloud/v1beta1
 kind: OIDCMiddlewareClient
 metadata:
   name: prometheus
+  namespace: monitoring
 spec:
   displayName: Prometheus
   uri: 'https://prom.k-space.ee'
@@ -482,6 +513,7 @@ apiVersion: codemowers.cloud/v1beta1
 kind: OIDCMiddlewareClient
 metadata:
   name: alertmanager
+  namespace: monitoring
 spec:
   displayName: AlertManager
   uri: 'https://am.k-space.ee'