feat: Add keda scalers.

kubernetes/components/keda/nfs-cpu-scaler/kustomization.yaml

@@ -0,0 +1,24 @@
+---
+# yaml-language-server: $schema=https://json.schemastore.org/kustomization
+apiVersion: kustomize.config.k8s.io/v1alpha1
+kind: Component
+components:
+  - ../nfs-scaler
+patches:
+  - patch: |-
+      - op: add
+        path: /spec/triggers/-
+        value:
+          type: cpu
+          metricType: Utilization
+          metadata:
+            value: '${SCALER_CPU_TARGET:="60"}'
+    target: &target
+      group: keda.sh
+      kind: ScaledObject
+  - patch: |-
+      # undo the nfs-scaler patch
+      - op: replace
+        path: /metadata/name
+        value: ${SCALER_SILENT}${APP}
+    target: *target

kubernetes/components/keda/nfs-scaler/kustomization.yaml

@@ -0,0 +1,19 @@
+---
+# yaml-language-server: $schema=https://json.schemastore.org/kustomization
+apiVersion: kustomize.config.k8s.io/v1alpha1
+kind: Component
+components:
+  - ../prometheus-scaler
+patches:
+  - patch: |-
+      - op: replace
+        path: /spec/triggers/0/metadata/query
+        value: max_over_time(probe_success{instance="10.0.0.14:2049"}[1m])
+    target: &target
+      group: keda.sh
+      kind: ScaledObject
+  - patch: |-
+      - op: replace
+        path: /metadata/name
+        value: silent-${APP}
+    target: *target

kubernetes/components/keda/prometheus-scaler/kustomization.yaml

@@ -0,0 +1,6 @@
+---
+# yaml-language-server: $schema=https://json.schemastore.org/kustomization
+apiVersion: kustomize.config.k8s.io/v1alpha1
+kind: Component
+resources:
+  - ./scaledobject.yaml

kubernetes/components/keda/prometheus-scaler/scaledobject.yaml

@@ -0,0 +1,23 @@
+---
+# yaml-language-server: $schema=https://schemas.tholinka.dev/keda.sh/scaledobject_v1alpha1.json
+apiVersion: keda.sh/v1alpha1
+kind: ScaledObject
+metadata:
+  name: ${SCALER_SILENT}${APP}
+spec:
+  advanced:
+    restoreToOriginalReplicaCount: true
+  scaleTargetRef:
+    apiVersion: ${SCALER_API_VERSION:=apps/v1}
+    kind: ${SCALER_TYPE:=Deployment}
+    name: ${SCALER_NAME:=${APP}}
+  cooldownPeriod: 0
+  minReplicaCount: ${SCALER_MIN_REPLICAS:=0}
+  maxReplicaCount: ${SCALER_MAX_REPLICAS:=1}
+  triggers:
+    - type: prometheus
+      metadata:
+        serverAddress: http://prometheus-operated.observability.svc.cluster.local.:9090
+        query: ${SCALER_QUERY}
+        threshold: '${SCALER_THRESHOLD:="1"}'
+        ignoreNullValues: '${SCALER_IGNORE_NULL:="0"}'