Add KEDAScalersInfo to display important information

CHANGELOG.md

@@ -89,6 +89,7 @@ New deprecation(s):
 ### Other
 
 - **General**: Bump newrelic-client-go deps to 2.51.2 (latest) ([#6325](https://github.com/kedacore/keda/pull/6325))
+- **General**: New eventreason KEDAScalersInfo to display important information ([#6328](https://github.com/kedacore/keda/pull/6328))
 
 
 ## v2.16.0

pkg/eventreason/eventreason.go

@@ -41,6 +41,9 @@ const (
 	// ScaledJobDeleted is for event when ScaledJob is deleted
 	ScaledJobDeleted = "ScaledJobDeleted"
 
+	// KEDAScalersInfo is for event when Scaler has additional info
+	KEDAScalersInfo = "KEDAScalerInfo"
+
 	// KEDAScalersStarted is for event when scalers watch started for ScaledObject or ScaledJob
 	KEDAScalersStarted = "KEDAScalersStarted"
 

pkg/scalers/cpu_memory_scaler.go

@@ -21,7 +21,7 @@ type cpuMemoryScaler struct {
 }
 
 type cpuMemoryMetadata struct {
-	Type               string `keda:"name=type,          order=triggerMetadata, enum=Utilization;AverageValue, optional"`
+	Type               string `keda:"name=type,          order=triggerMetadata, enum=Utilization;AverageValue, optional, deprecatedAnnounce=The 'type' setting is DEPRECATED and will be removed in v2.18 - Use 'metricType' instead."`
 	Value              string `keda:"name=value,         order=triggerMetadata"`
 	ContainerName      string `keda:"name=containerName, order=triggerMetadata, optional"`
 	AverageValue       *resource.Quantity
@@ -33,19 +33,21 @@ type cpuMemoryMetadata struct {
 func NewCPUMemoryScaler(resourceName v1.ResourceName, config *scalersconfig.ScalerConfig) (Scaler, error) {
 	logger := InitializeLogger(config, "cpu_memory_scaler")
 
-	meta, err := parseResourceMetadata(config, logger)
+	meta, err := parseResourceMetadata(config)
 	if err != nil {
 		return nil, fmt.Errorf("error parsing %s metadata: %w", resourceName, err)
 	}
 
-	return &cpuMemoryScaler{
+	scaler := &cpuMemoryScaler{
 		metadata:     meta,
 		resourceName: resourceName,
 		logger:       logger,
-	}, nil
+	}
+
+	return scaler, nil
 }
 
-func parseResourceMetadata(config *scalersconfig.ScalerConfig, logger logr.Logger) (cpuMemoryMetadata, error) {
+func parseResourceMetadata(config *scalersconfig.ScalerConfig) (cpuMemoryMetadata, error) {
 	meta := cpuMemoryMetadata{}
 	err := config.TypedConfig(&meta)
 	if err != nil {
@@ -58,7 +60,6 @@ func parseResourceMetadata(config *scalersconfig.ScalerConfig, logger logr.Logge
 
 	// This is deprecated and can be removed later
 	if meta.Type != "" {
-		logger.Info("The 'type' setting is DEPRECATED and will be removed in v2.18 - Use 'metricType' instead.")
 		switch meta.Type {
 		case "AverageValue":
 			meta.MetricType = v2.AverageValueMetricType

pkg/scalers/cpu_memory_scaler_test.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"testing"
 
-	"github.com/go-logr/logr"
 	"github.com/stretchr/testify/assert"
 	v2 "k8s.io/api/autoscaling/v2"
 	v1 "k8s.io/api/core/v1"
@@ -43,13 +42,12 @@ var testCPUMemoryMetadata = []parseCPUMemoryMetadataTestData{
 }
 
 func TestCPUMemoryParseMetadata(t *testing.T) {
-	logger := logr.Discard()
 	for i, testData := range testCPUMemoryMetadata {
 		config := &scalersconfig.ScalerConfig{
 			TriggerMetadata: testData.metadata,
 			MetricType:      testData.metricType,
 		}
-		_, err := parseResourceMetadata(config, logger)
+		_, err := parseResourceMetadata(config)
 		if err != nil && !testData.isError {
 			t.Errorf("Test case %d: Expected success but got error: %v", i, err)
 		}

pkg/scalers/ibmmq_scaler.go

@@ -34,7 +34,7 @@ type ibmmqMetadata struct {
 	Username             string   `keda:"name=username,             order=authParams;resolvedEnv;triggerMetadata"`
 	Password             string   `keda:"name=password,             order=authParams;resolvedEnv;triggerMetadata"`
 	UnsafeSsl            bool     `keda:"name=unsafeSsl,            order=triggerMetadata, default=false"`
-	TLS                  bool     `keda:"name=tls,                  order=triggerMetadata, default=false"` // , deprecated=use unsafeSsl instead
+	TLS                  bool     `keda:"name=tls,                  order=triggerMetadata, default=false, deprecatedAnnounce=The 'tls' setting is DEPRECATED and will be removed in v2.18 - Use 'unsafeSsl' instead"`
 	CA                   string   `keda:"name=ca,                   order=authParams, optional"`
 	Cert                 string   `keda:"name=cert,                 order=authParams, optional"`
 	Key                  string   `keda:"name=key,                  order=authParams, optional"`
@@ -92,7 +92,6 @@ func NewIBMMQScaler(config *scalersconfig.ScalerConfig) (Scaler, error) {
 
 	// TODO: DEPRECATED to be removed in v2.18
 	if meta.TLS {
-		logger.Info("The 'tls' setting is DEPRECATED and will be removed in v2.18 - Use 'unsafeSsl' instead")
 		meta.UnsafeSsl = meta.TLS
 	}
 
@@ -106,12 +105,14 @@ func NewIBMMQScaler(config *scalersconfig.ScalerConfig) (Scaler, error) {
 		httpClient.Transport = kedautil.CreateHTTPTransportWithTLSConfig(tlsConfig)
 	}
 
-	return &ibmmqScaler{
+	scaler := &ibmmqScaler{
 		metricType: metricType,
 		metadata:   meta,
 		httpClient: httpClient,
 		logger:     logger,
-	}, nil
+	}
+
+	return scaler, nil
 }
 
 func (s *ibmmqScaler) Close(context.Context) error {

pkg/scalers/scalersconfig/scalersconfig.go

@@ -20,6 +20,8 @@ import (
 	"time"
 
 	v2 "k8s.io/api/autoscaling/v2"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/client-go/tools/record"
 
 	kedav1alpha1 "github.com/kedacore/keda/v2/apis/keda/v1alpha1"
 )
@@ -41,6 +43,9 @@ type ScalerConfig struct {
 	// Name of the trigger
 	TriggerName string
 
+	// Trigger type (name of the trigger, also the scaler name)
+	TriggerType string
+
 	// Marks whether we should query metrics only during the polling interval
 	// Any requests for metrics in between are read from the cache
 	TriggerUseCachedMetrics bool
@@ -68,4 +73,10 @@ type ScalerConfig struct {
 
 	// When we use the scaler for composite scaler, we shouldn't require the value because it'll be ignored
 	AsMetricSource bool
+
+	// For events
+	Recorder record.EventRecorder
+
+	// ScaledObjct
+	ScaledObject runtime.Object
 }

pkg/scalers/scalersconfig/typed_config.go

@@ -28,6 +28,9 @@ import (
 
 	"golang.org/x/exp/maps"
 	"golang.org/x/exp/slices"
+	corev1 "k8s.io/api/core/v1"
+
+	"github.com/kedacore/keda/v2/pkg/eventreason"
 )
 
 // CustomValidator is an interface that can be implemented to validate the configuration of the typed config
@@ -67,15 +70,16 @@ const (
 
 // field tag parameters
 const (
-	optionalTag     = "optional"
-	deprecatedTag   = "deprecated"
-	defaultTag      = "default"
-	orderTag        = "order"
-	nameTag         = "name"
-	enumTag         = "enum"
-	exclusiveSetTag = "exclusiveSet"
-	rangeTag        = "range"
-	separatorTag    = "separator"
+	optionalTag           = "optional"
+	deprecatedTag         = "deprecated"
+	deprecatedAnnounceTag = "deprecatedAnnounce"
+	defaultTag            = "default"
+	orderTag              = "order"
+	nameTag               = "name"
+	enumTag               = "enum"
+	exclusiveSetTag       = "exclusiveSet"
+	rangeTag              = "range"
+	separatorTag          = "separator"
 )
 
 // Params is a struct that represents the parameter list that can be used in the keda tag
@@ -101,6 +105,10 @@ type Params struct {
 	// as an error and the DeprecatedMessage should be returned to the user
 	Deprecated string
 
+	// DeprecatedAnnounce is the 'deprecatedAnnounce' tag parameter, if set this will trigger
+	// an info event with the deprecation message
+	DeprecatedAnnounce string
+
 	// Enum is the 'enum' tag parameter defining the list of possible values for the parameter
 	Enum []string
 
@@ -195,6 +203,13 @@ func (sc *ScalerConfig) setValue(field reflect.Value, params Params) error {
 	if exists && params.IsDeprecated() {
 		return fmt.Errorf("parameter %q is deprecated%v", params.Name(), params.DeprecatedMessage())
 	}
+	if exists && params.DeprecatedAnnounce != "" {
+		if sc.Recorder != nil {
+			message := fmt.Sprintf("Scaler %s info: %s", sc.TriggerType, params.DeprecatedAnnounce)
+			fmt.Print(message)
+			sc.Recorder.Event(sc.ScaledObject, corev1.EventTypeNormal, eventreason.KEDAScalersInfo, message)
+		}
+	}
 	if !exists && params.Default != "" {
 		exists = true
 		valFromConfig = params.Default
@@ -480,6 +495,12 @@ func paramsFromTag(tag string, field reflect.StructField) (Params, error) {
 			} else {
 				params.Deprecated = strings.TrimSpace(tsplit[1])
 			}
+		case deprecatedAnnounceTag:
+			if len(tsplit) == 1 {
+				params.DeprecatedAnnounce = deprecatedAnnounceTag
+			} else {
+				params.DeprecatedAnnounce = strings.TrimSpace(tsplit[1])
+			}
 		case defaultTag:
 			if len(tsplit) > 1 {
 				params.Default = strings.TrimSpace(tsplit[1])

pkg/scalers/scalersconfig/typed_config_test.go

@@ -21,6 +21,7 @@ import (
 	"testing"
 
 	. "github.com/onsi/gomega"
+	"k8s.io/apimachinery/pkg/runtime"
 )
 
 // TestBasicTypedConfig tests the basic types for typed config
@@ -583,3 +584,50 @@ func TestMultiName(t *testing.T) {
 	Expect(err).To(BeNil())
 	Expect(ts.Property).To(Equal("bbb"))
 }
+
+// TestDeprecatedAnnounce tests the deprecatedAnnounce tag
+func TestDeprecatedAnnounce(t *testing.T) {
+	RegisterTestingT(t)
+
+	// Create a mock recorder to capture the event
+	mockRecorder := &MockEventRecorder{}
+
+	sc := &ScalerConfig{
+		TriggerMetadata: map[string]string{
+			"oldParam": "value1",
+		},
+		Recorder: mockRecorder,
+	}
+
+	type testStruct struct {
+		OldParam string `keda:"name=oldParam, order=triggerMetadata, deprecatedAnnounce=This parameter is deprecated. Use newParam instead"`
+	}
+
+	ts := testStruct{}
+	err := sc.TypedConfig(&ts)
+	Expect(err).To(BeNil())
+	Expect(ts.OldParam).To(Equal("value1"))
+
+	// Verify that the deprecation event was recorded
+	Expect(mockRecorder.EventCalled).To(BeTrue())
+	Expect(mockRecorder.Message).To(Equal("Scaler  info: This parameter is deprecated. Use newParam instead"))
+}
+
+// MockEventRecorder is a mock implementation of record.EventRecorder
+type MockEventRecorder struct {
+	EventCalled bool
+	Message     string
+}
+
+func (m *MockEventRecorder) Event(object runtime.Object, eventtype, reason, message string) {
+	m.EventCalled = true
+	m.Message = message
+}
+
+func (m *MockEventRecorder) Eventf(object runtime.Object, eventtype, reason, messageFmt string, args ...interface{}) {
+	// Not needed
+}
+
+func (m *MockEventRecorder) AnnotatedEventf(object runtime.Object, annotations map[string]string, eventtype, reason, messageFmt string, args ...interface{}) {
+	// Not needed
+}

pkg/scaling/scalers_builder.go

@@ -59,13 +59,16 @@ func (h *scaleHandler) buildScalers(ctx context.Context, withTriggers *kedav1alp
 				ScalableObjectType:      withTriggers.Kind,
 				TriggerName:             trigger.Name,
 				TriggerMetadata:         trigger.Metadata,
+				TriggerType:             trigger.Type,
 				TriggerUseCachedMetrics: trigger.UseCachedMetrics,
 				ResolvedEnv:             resolvedEnv,
 				AuthParams:              make(map[string]string),
 				GlobalHTTPTimeout:       h.globalHTTPTimeout,
 				TriggerIndex:            triggerIndex,
 				MetricType:              trigger.MetricType,
 				AsMetricSource:          asMetricSource,
+				ScaledObject:            withTriggers,
+				Recorder:                h.recorder,
 				TriggerUniqueKey:        fmt.Sprintf("%s-%s-%s-%d", withTriggers.Kind, withTriggers.Namespace, withTriggers.Name, triggerIndex),
 			}