Implement EnabledPeriod for scheduled scaling activity

Author: Artem Meshcheryakov

CHANGELOG.md

@@ -8,6 +8,8 @@ All the unreleased changes are listed under `Unreleased` section. Add your chang
 
 ## Unreleased
 
+* feat: support scheduled activity for ElastiService objects by `@artazar` in [`#243`](https://github.com/truefoundry/KubeElasti/pull/243)
+
 ## v0.1.21 (2026-01-16)
 
 ### Improvements

docs/src/gs-configure-elastiservice.md

@@ -30,6 +30,9 @@ spec:
     apiVersion: <apiVersion> # (5)
     kind: <kind> # (6)
     name: <deployment-or-rollout-or-statefulset-name> # (7)
+  enabledPeriod: # (15) Optional
+    schedule: <cron-schedule> # (16)
+    duration: <duration> # (17)
   triggers:
   - type: <trigger-type> # (8)
     metadata:
@@ -56,6 +59,9 @@ spec:
 12. Replace it with the uptime filter of your TSDB instance. Default: `container="prometheus"`.
 13. Replace it with the autoscaler name. In this case, it is the name of the KEDA ScaledObject.
 14. Replace it with the autoscaler type. In this case, it is `keda`.
+15. **Optional**: Define when scale-to-zero is active. Omit this field for always-on behavior.
+16. Replace with a 5-item cron expression (minute hour day month weekday) in UTC.
+17. Replace with a duration string (e.g., "8h", "24h").
 
 The key fields to be specified in the spec are:
 
@@ -133,4 +139,51 @@ autoscaler:
 
 As soon as the service is scaled down to 0, KubeElasti **resolver** will start accepting requests for that service. On receiving the first request, it will scale up the service to `minTargetReplicas`. Once the pod is up, the new requests are handled by the service pods and do not pass through the elasti-resolver. The requests that came before the pod scaled up are held in memory of the elasti-resolver and are processed once the pod is up.
 
-We can configure the `cooldownPeriod` to specify the minimum time (in seconds) to wait after scaling up before considering scale down.
+We can configure the `cooldownPeriod` to specify the minimum time (in seconds) to wait after scaling up before considering scale down.
+
+<br>
+
+### **5. EnabledPeriod: Control when scale-to-zero is active (Optional)**
+
+The `enabledPeriod` field allows you to define specific time windows when the scale-to-zero policy should be active. Outside of these periods, KubeElasti will maintain the service at `minTargetReplicas` and prevent scale-down. This is useful for scenarios like:
+
+- Only allowing scale-to-zero during night hours
+- Preventing scale-down during business hours when you want services always ready
+- Scheduling scale-to-zero for the weekends
+
+**Configuration:**
+
+```yaml
+enabledPeriod:
+  schedule: "0 22 * * *"   # Cron expression (5 fields)
+  duration: "12h"          # How long the period lasts
+```
+
+**Fields:**
+
+- **schedule**: A 5-item cron expression defining when the enabled period starts
+  - Format: `minute hour day month weekday`
+  - Uses UTC timezone
+  - Examples:
+    - `"0 9 * * 1-5"` - 9 AM Monday through Friday
+    - `"0 0 * * *"` - Daily at midnight
+    - `"*/15 8-17 * * 1-5"` - Every 15 minutes, 8 AM to 5 PM, weekdays
+  - Default: `"0 0 * * *"` (daily at midnight)
+
+- **duration**: How long the enabled period lasts from each scheduled trigger
+  - Format: Go duration string (e.g., "1h", "30m", "8h", "24h")
+  - Default: `"24h"`
+
+**Behavior:**
+
+- When `enabledPeriod` is **omitted**: Scale-to-zero is always active (default behavior)
+- When `enabledPeriod` is **specified**:
+  - During the enabled window: Normal scale-to-zero behavior applies
+  - Outside the enabled window: Service maintains `minTargetReplicas`, scale-down is prevented
+
+**Important Notes:**
+
+- All times use **UTC timezone**
+- The cron expression uses 5 fields (not 6 - no seconds field)
+- Invalid cron expressions will log warnings and default to enabled (fail-open)
+- For durations longer than 24h with daily triggers, services may always be enabled

go.work.sum

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operator/api/v1alpha1/elastiservice_types.go

@@ -26,6 +26,20 @@ const (
 	ElastiServiceFinalizer = "elasti.truefoundry.com/finalizer"
 )
 
+// EnabledPeriod defines when the scale-to-zero policy is active.
+// Outside of this period, services maintain minTargetReplicas and scale-down is prevented.
+type EnabledPeriod struct {
+	// Schedule is a 5-item cron expression (minute hour day month weekday).
+	// Uses UTC timezone. Example: "0 9 * * 1-5" for 9 AM Monday-Friday.
+	// +kubebuilder:default="0 0 * * *"
+	Schedule string `json:"schedule,omitempty"`
+
+	// Duration specifies how long the enabled period lasts from each scheduled trigger.
+	// Accepts formats like "1h", "30m", "8h", etc.
+	// +kubebuilder:default="24h"
+	Duration string `json:"duration,omitempty"`
+}
+
 // +kubebuilder:validation:Required={"scaleTargetRef","service"}
 type ElastiServiceSpec struct {
 	// ScaleTargetRef of the target resource to scale
@@ -45,6 +59,10 @@ type ElastiServiceSpec struct {
 	// +kubebuilder:validation:MinItems=1
 	Triggers   []ScaleTrigger  `json:"triggers,omitempty"`
 	Autoscaler *AutoscalerSpec `json:"autoscaler,omitempty"`
+	// EnabledPeriod defines when the scale-to-zero policy is active.
+	// When omitted, scale-to-zero is always enabled (default behavior).
+	// When specified, scale-down only occurs during the cron schedule window.
+	EnabledPeriod *EnabledPeriod `json:"enabledPeriod,omitempty"`
 }
 
 func (es *ElastiServiceSpec) GetScaleTargetRef() ScaleTargetRef {

operator/api/v1alpha1/zz_generated.deepcopy.go

@@ -60,6 +60,25 @@ spec:
                 maximum: 604800
                 minimum: 0
                 type: integer
+              enabledPeriod:
+                description: |-
+                  EnabledPeriod defines when the scale-to-zero policy is active.
+                  When omitted, scale-to-zero is always enabled (default behavior).
+                  When specified, scale-down only occurs during the cron schedule window.
+                properties:
+                  duration:
+                    default: 24h
+                    description: |-
+                      Duration specifies how long the enabled period lasts from each scheduled trigger.
+                      Accepts formats like "1h", "30m", "8h", etc.
+                    type: string
+                  schedule:
+                    default: 0 0 * * *
+                    description: |-
+                      Schedule is a 5-item cron expression (minute hour day month weekday).
+                      Uses UTC timezone. Example: "0 9 * * 1-5" for 9 AM Monday-Friday.
+                    type: string
+                type: object
               minTargetReplicas:
                 description: Minimum number of replicas to scale to
                 format: int32

operator/config/crd/bases/elasti.truefoundry.com_elastiservices.yaml

@@ -6,4 +6,36 @@ metadata:
     app.kubernetes.io/managed-by: kustomize
   name: elastiservice-sample
 spec:
-  # TODO(user): Add fields here
+  service: my-service
+  scaleTargetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: my-deployment
+  minTargetReplicas: 1
+  cooldownPeriod: 900
+  triggers:
+    - type: prometheus
+      metadata:
+        query: "rate(http_requests_total[5m])"
+        threshold: "0"
+---
+apiVersion: elasti.truefoundry.com/v1alpha1
+kind: ElastiService
+metadata:
+  name: elastiservice-with-schedule
+spec:
+  service: my-scheduled-service
+  scaleTargetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: my-scheduled-deployment
+  minTargetReplicas: 1
+  cooldownPeriod: 900
+  enabledPeriod:
+    schedule: "0 22 * * *"  # 10 PM Daily (UTC)
+    duration: "12h"         # Active for 12 hours
+  triggers:
+    - type: prometheus
+      metadata:
+        query: "rate(http_requests_total[5m])"
+        threshold: "0"

operator/config/samples/elasti_v1alpha1_elastiservice.yaml

@@ -52,6 +52,7 @@ require (
 	github.com/prometheus/client_model v0.6.2 // indirect
 	github.com/prometheus/common v0.66.1 // indirect
 	github.com/prometheus/procfs v0.16.1 // indirect
+	github.com/robfig/cron/v3 v3.0.1 // indirect
 	github.com/spf13/pflag v1.0.6 // indirect
 	github.com/x448/float16 v0.8.4 // indirect
 	go.uber.org/automaxprocs v1.6.0 // indirect

operator/go.mod

@@ -98,6 +98,8 @@ github.com/prometheus/common v0.66.1 h1:h5E0h5/Y8niHc5DlaLlWLArTQI7tMrsfQjHV+d9Z
 github.com/prometheus/common v0.66.1/go.mod h1:gcaUsgf3KfRSwHY4dIMXLPV0K/Wg1oZ8+SbZk/HH/dA=
 github.com/prometheus/procfs v0.16.1 h1:hZ15bTNuirocR6u0JZ6BAHHmwS1p8B4P6MRqxtzMyRg=
 github.com/prometheus/procfs v0.16.1/go.mod h1:teAbpZRB1iIAJYREa1LsoWUXykVXA1KlTmWl8x/U+Is=
+github.com/robfig/cron/v3 v3.0.1 h1:WdRxkvbJztn8LMz/QEvLN5sBU+xKpSqwwUO1Pjr4qDs=
+github.com/robfig/cron/v3 v3.0.1/go.mod h1:eQICP3HwyT7UooqI/z+Ov+PtYAWygg1TEWWzGIFLtro=
 github.com/rogpeppe/go-internal v1.13.1 h1:KvO1DLK/DRN07sQ1LQKScxyZJuNnedQ5/wKSR38lUII=
 github.com/rogpeppe/go-internal v1.13.1/go.mod h1:uMEvuHeurkdAXX61udpOXGD/AzZDWNMNyH2VO9fmH0o=
 github.com/spf13/pflag v1.0.6 h1:jFzHGLGAlb3ruxLB8MhbI6A8+AQX/2eW4qeyNZXNp2o=