feat: Use mili scale to support more precision

.gitignore

@@ -44,3 +44,6 @@ cover.out
 
 # GO debug binary
 cmd/manager/debug.test
+
+# GO Test result
+report.xml

CHANGELOG.md

@@ -40,6 +40,7 @@ To learn more about our roadmap, we recommend reading [this document](ROADMAP.md
 
 ### Improvements
 
+- **General:** Use `mili` scale for the returned metrics ([#3135](https://github.com/kedacore/keda/issue/3135))
 - **General:** Use more readable timestamps in KEDA Operator logs ([#3066](https://github.com/kedacore/keda/issue/3066))
 - **Prometheus Scaler:** Add ignoreNullValues to return error when prometheus return null in values ([#3065](https://github.com/kedacore/keda/issues/3065))
 - **Selenium Grid Scaler:** Edge active sessions not being properly counted ([#2709](https://github.com/kedacore/keda/issues/2709))

pkg/scalers/activemq_scaler.go

@@ -13,8 +13,6 @@ import (
 	"text/template"
 
 	v2beta2 "k8s.io/api/autoscaling/v2beta2"
-	"k8s.io/apimachinery/pkg/api/resource"
-	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/labels"
 	"k8s.io/metrics/pkg/apis/external_metrics"
 	logf "sigs.k8s.io/controller-runtime/pkg/log"
@@ -275,11 +273,7 @@ func (s *activeMQScaler) GetMetrics(ctx context.Context, metricName string, metr
 		return nil, fmt.Errorf("error inspecting ActiveMQ queue size: %s", err)
 	}
 
-	metric := external_metrics.ExternalMetricValue{
-		MetricName: metricName,
-		Value:      *resource.NewQuantity(queueSize, resource.DecimalSI),
-		Timestamp:  metav1.Now(),
-	}
+	metric := GenerateMetricInMili(metricName, float64(queueSize))
 
 	return []external_metrics.ExternalMetricValue{metric}, nil
 }

pkg/scalers/artemis_scaler.go

@@ -11,8 +11,6 @@ import (
 	"strings"
 
 	v2beta2 "k8s.io/api/autoscaling/v2beta2"
-	"k8s.io/apimachinery/pkg/api/resource"
-	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/labels"
 	"k8s.io/metrics/pkg/apis/external_metrics"
 	logf "sigs.k8s.io/controller-runtime/pkg/log"
@@ -277,11 +275,7 @@ func (s *artemisScaler) GetMetrics(ctx context.Context, metricName string, metri
 		return []external_metrics.ExternalMetricValue{}, err
 	}
 
-	metric := external_metrics.ExternalMetricValue{
-		MetricName: metricName,
-		Value:      *resource.NewQuantity(messages, resource.DecimalSI),
-		Timestamp:  metav1.Now(),
-	}
+	metric := GenerateMetricInMili(metricName, float64(messages))
 
 	return append([]external_metrics.ExternalMetricValue{}, metric), nil
 }

pkg/scalers/aws_cloudwatch_scaler.go

@@ -14,8 +14,6 @@ import (
 	"github.com/aws/aws-sdk-go/service/cloudwatch"
 	"github.com/aws/aws-sdk-go/service/cloudwatch/cloudwatchiface"
 	"k8s.io/api/autoscaling/v2beta2"
-	"k8s.io/apimachinery/pkg/api/resource"
-	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/labels"
 	"k8s.io/metrics/pkg/apis/external_metrics"
 	logf "sigs.k8s.io/controller-runtime/pkg/log"
@@ -43,8 +41,8 @@ type awsCloudwatchMetadata struct {
 	dimensionValue []string
 	expression     string
 
-	targetMetricValue int64
-	minMetricValue    int64
+	targetMetricValue float64
+	minMetricValue    float64
 
 	metricCollectionTime int64
 	metricStat           string
@@ -96,6 +94,22 @@ func getIntMetadataValue(metadata map[string]string, key string, required bool,
 	return defaultValue, nil
 }
 
+func getFloatMetadataValue(metadata map[string]string, key string, required bool, defaultValue float64) (float64, error) {
+	if val, ok := metadata[key]; ok && val != "" {
+		value, err := strconv.ParseFloat(val, 64)
+		if err != nil {
+			return 0, fmt.Errorf("error parsing %s metadata: %v", key, err)
+		}
+		return value, nil
+	}
+
+	if required {
+		return 0, fmt.Errorf("metadata %s not given", key)
+	}
+
+	return defaultValue, nil
+}
+
 func createCloudwatchClient(metadata *awsCloudwatchMetadata) *cloudwatch.CloudWatch {
 	sess := session.Must(session.NewSession(&aws.Config{
 		Region: aws.String(metadata.awsRegion),
@@ -167,12 +181,12 @@ func parseAwsCloudwatchMetadata(config *ScalerConfig) (*awsCloudwatchMetadata, e
 		}
 	}
 
-	meta.targetMetricValue, err = getIntMetadataValue(config.TriggerMetadata, "targetMetricValue", true, 0)
+	meta.targetMetricValue, err = getFloatMetadataValue(config.TriggerMetadata, "targetMetricValue", true, 0)
 	if err != nil {
 		return nil, err
 	}
 
-	meta.minMetricValue, err = getIntMetadataValue(config.TriggerMetadata, "minMetricValue", true, 0)
+	meta.minMetricValue, err = getFloatMetadataValue(config.TriggerMetadata, "minMetricValue", true, 0)
 	if err != nil {
 		return nil, err
 	}
@@ -278,11 +292,7 @@ func (c *awsCloudwatchScaler) GetMetrics(ctx context.Context, metricName string,
 		return []external_metrics.ExternalMetricValue{}, err
 	}
 
-	metric := external_metrics.ExternalMetricValue{
-		MetricName: metricName,
-		Value:      *resource.NewQuantity(metricValue, resource.DecimalSI),
-		Timestamp:  metav1.Now(),
-	}
+	metric := GenerateMetricInMili(metricName, metricValue)
 
 	return append([]external_metrics.ExternalMetricValue{}, metric), nil
 }
@@ -300,7 +310,7 @@ func (c *awsCloudwatchScaler) GetMetricSpecForScaling(context.Context) []v2beta2
 		Metric: v2beta2.MetricIdentifier{
 			Name: GenerateMetricNameWithIndex(c.metadata.scalerIndex, kedautil.NormalizeString(fmt.Sprintf("aws-cloudwatch-%s", metricNameSuffix))),
 		},
-		Target: GetMetricTarget(c.metricType, c.metadata.targetMetricValue),
+		Target: GetMetricTargetMili(c.metricType, c.metadata.targetMetricValue),
 	}
 	metricSpec := v2beta2.MetricSpec{External: externalMetric, Type: externalMetricType}
 	return []v2beta2.MetricSpec{metricSpec}
@@ -320,7 +330,7 @@ func (c *awsCloudwatchScaler) Close(context.Context) error {
 	return nil
 }
 
-func (c *awsCloudwatchScaler) GetCloudwatchMetrics() (int64, error) {
+func (c *awsCloudwatchScaler) GetCloudwatchMetrics() (float64, error) {
 	var input cloudwatch.GetMetricDataInput
 
 	startTime, endTime := computeQueryWindow(time.Now(), c.metadata.metricStatPeriod, c.metadata.metricEndTimeOffset, c.metadata.metricCollectionTime)
@@ -384,9 +394,9 @@ func (c *awsCloudwatchScaler) GetCloudwatchMetrics() (int64, error) {
 	}
 
 	cloudwatchLog.V(1).Info("Received Metric Data", "data", output)
-	var metricValue int64
+	var metricValue float64
 	if len(output.MetricDataResults) > 0 && len(output.MetricDataResults[0].Values) > 0 {
-		metricValue = int64(*output.MetricDataResults[0].Values[0])
+		metricValue = *output.MetricDataResults[0].Values[0]
 	} else {
 		cloudwatchLog.Info("empty metric data received, returning minMetricValue")
 		metricValue = c.metadata.minMetricValue

pkg/scalers/aws_dynamodb_scaler.go

@@ -15,8 +15,6 @@ import (
 	"github.com/aws/aws-sdk-go/service/dynamodb/dynamodbiface"
 	"go.mongodb.org/mongo-driver/bson"
 	"k8s.io/api/autoscaling/v2beta2"
-	"k8s.io/apimachinery/pkg/api/resource"
-	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/labels"
 	"k8s.io/metrics/pkg/apis/external_metrics"
 	logf "sigs.k8s.io/controller-runtime/pkg/log"
@@ -168,11 +166,7 @@ func (c *awsDynamoDBScaler) GetMetrics(ctx context.Context, metricName string, m
 		return []external_metrics.ExternalMetricValue{}, err
 	}
 
-	metric := external_metrics.ExternalMetricValue{
-		MetricName: metricName,
-		Value:      *resource.NewQuantity(metricValue, resource.DecimalSI),
-		Timestamp:  metav1.Now(),
-	}
+	metric := GenerateMetricInMili(metricName, metricValue)
 
 	return append([]external_metrics.ExternalMetricValue{}, metric), nil
 }
@@ -204,7 +198,7 @@ func (c *awsDynamoDBScaler) Close(context.Context) error {
 	return nil
 }
 
-func (c *awsDynamoDBScaler) GetQueryMetrics() (int64, error) {
+func (c *awsDynamoDBScaler) GetQueryMetrics() (float64, error) {
 	dimensions := dynamodb.QueryInput{
 		TableName:                 aws.String(c.metadata.tableName),
 		KeyConditionExpression:    aws.String(c.metadata.keyConditionExpression),
@@ -218,7 +212,7 @@ func (c *awsDynamoDBScaler) GetQueryMetrics() (int64, error) {
 		return 0, err
 	}
 
-	return *res.Count, nil
+	return float64(*res.Count), nil
 }
 
 // json2Map convert Json to map[string]string

pkg/scalers/aws_kinesis_stream_scaler.go

@@ -12,8 +12,6 @@ import (
 	"github.com/aws/aws-sdk-go/service/kinesis"
 	"github.com/aws/aws-sdk-go/service/kinesis/kinesisiface"
 	v2beta2 "k8s.io/api/autoscaling/v2beta2"
-	"k8s.io/apimachinery/pkg/api/resource"
-	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/labels"
 	"k8s.io/metrics/pkg/apis/external_metrics"
 	logf "sigs.k8s.io/controller-runtime/pkg/log"
@@ -158,11 +156,7 @@ func (s *awsKinesisStreamScaler) GetMetrics(ctx context.Context, metricName stri
 		return []external_metrics.ExternalMetricValue{}, err
 	}
 
-	metric := external_metrics.ExternalMetricValue{
-		MetricName: metricName,
-		Value:      *resource.NewQuantity(shardCount, resource.DecimalSI),
-		Timestamp:  metav1.Now(),
-	}
+	metric := GenerateMetricInMili(metricName, float64(shardCount))
 
 	return append([]external_metrics.ExternalMetricValue{}, metric), nil
 }

pkg/scalers/aws_sqs_queue_scaler.go

@@ -14,8 +14,6 @@ import (
 	"github.com/aws/aws-sdk-go/service/sqs"
 	"github.com/aws/aws-sdk-go/service/sqs/sqsiface"
 	v2beta2 "k8s.io/api/autoscaling/v2beta2"
-	"k8s.io/apimachinery/pkg/api/resource"
-	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/labels"
 	"k8s.io/metrics/pkg/apis/external_metrics"
 	logf "sigs.k8s.io/controller-runtime/pkg/log"
@@ -181,11 +179,7 @@ func (s *awsSqsQueueScaler) GetMetrics(ctx context.Context, metricName string, m
 		return []external_metrics.ExternalMetricValue{}, err
 	}
 
-	metric := external_metrics.ExternalMetricValue{
-		MetricName: metricName,
-		Value:      *resource.NewQuantity(queuelen, resource.DecimalSI),
-		Timestamp:  metav1.Now(),
-	}
+	metric := GenerateMetricInMili(metricName, float64(queuelen))
 
 	return append([]external_metrics.ExternalMetricValue{}, metric), nil
 }

pkg/scalers/azure/azure_app_insights.go

@@ -3,7 +3,6 @@ package azure
 import (
 	"context"
 	"fmt"
-	"math"
 	"net/http"
 	"strconv"
 	"strings"
@@ -77,7 +76,7 @@ func getAuthConfig(ctx context.Context, info AppInsightsInfo, podIdentity kedav1
 	return nil
 }
 
-func extractAppInsightValue(info AppInsightsInfo, metric ApplicationInsightsMetric) (int64, error) {
+func extractAppInsightValue(info AppInsightsInfo, metric ApplicationInsightsMetric) (float64, error) {
 	if _, ok := metric.Value[info.MetricID]; !ok {
 		return -1, fmt.Errorf("metric named %s not found in app insights response", info.MetricID)
 	}
@@ -94,7 +93,7 @@ func extractAppInsightValue(info AppInsightsInfo, metric ApplicationInsightsMetr
 
 	azureAppInsightsLog.V(2).Info("value extracted from metric request", "metric type", info.AggregationType, "metric value", floatVal)
 
-	return int64(math.Round(floatVal)), nil
+	return floatVal, nil
 }
 
 func queryParamsForAppInsightsRequest(info AppInsightsInfo) (map[string]interface{}, error) {
@@ -115,7 +114,7 @@ func queryParamsForAppInsightsRequest(info AppInsightsInfo) (map[string]interfac
 }
 
 // GetAzureAppInsightsMetricValue returns the value of an Azure App Insights metric, rounded to the nearest int
-func GetAzureAppInsightsMetricValue(ctx context.Context, info AppInsightsInfo, podIdentity kedav1alpha1.PodIdentityProvider) (int64, error) {
+func GetAzureAppInsightsMetricValue(ctx context.Context, info AppInsightsInfo, podIdentity kedav1alpha1.PodIdentityProvider) (float64, error) {
 	config := getAuthConfig(ctx, info, podIdentity)
 	authorizer, err := config.Authorizer()
 	if err != nil {

pkg/scalers/azure/azure_app_insights_test.go

@@ -12,7 +12,7 @@ import (
 type testExtractAzAppInsightsTestData struct {
 	testName      string
 	isError       bool
-	expectedValue int64
+	expectedValue float64
 	info          AppInsightsInfo
 	metricResult  ApplicationInsightsMetric
 }
@@ -48,8 +48,6 @@ var testExtractAzAppInsightsData = []testExtractAzAppInsightsTestData{
 	{"metric not found", true, -1, mockAppInsightsInfo("avg"), mockAppInsightsMetric("test/test", "avg", newMetricValue(0.0))},
 	{"metric is nil", true, -1, mockAppInsightsInfo("avg"), mockAppInsightsMetric("testns/test", "avg", nil)},
 	{"incorrect aggregation type", true, -1, mockAppInsightsInfo("avg"), mockAppInsightsMetric("testns/test", "max", newMetricValue(0.0))},
-	{"success round down value", false, 5, mockAppInsightsInfo("max"), mockAppInsightsMetric("testns/test", "max", newMetricValue(5.2))},
-	{"success round up value", false, 6, mockAppInsightsInfo("max"), mockAppInsightsMetric("testns/test", "max", newMetricValue(5.5))},
 }
 
 func TestAzGetAzureAppInsightsMetricValue(t *testing.T) {

pkg/scalers/azure/azure_data_explorer.go

@@ -40,7 +40,7 @@ type DataExplorerMetadata struct {
 	PodIdentity             kedav1alpha1.PodIdentityProvider
 	Query                   string
 	TenantID                string
-	Threshold               int64
+	Threshold               float64
 	ActiveDirectoryEndpoint string
 }
 
@@ -95,7 +95,7 @@ func getDataExplorerAuthConfig(ctx context.Context, metadata *DataExplorerMetada
 	return nil, fmt.Errorf("missing credentials. please reconfigure your scaled object metadata")
 }
 
-func GetAzureDataExplorerMetricValue(ctx context.Context, client *kusto.Client, db string, query string) (int64, error) {
+func GetAzureDataExplorerMetricValue(ctx context.Context, client *kusto.Client, db string, query string) (float64, error) {
 	azureDataExplorerLogger.V(1).Info("Querying Azure Data Explorer", "db", db, "query", query)
 
 	iter, err := client.Query(ctx, db, kusto.NewStmt("", kusto.UnsafeStmt(unsafe.Stmt{Add: true, SuppressWarning: false})).UnsafeAdd(query))
@@ -130,7 +130,7 @@ func GetAzureDataExplorerMetricValue(ctx context.Context, client *kusto.Client,
 	return metricValue, nil
 }
 
-func extractDataExplorerMetricValue(row *table.Row) (int64, error) {
+func extractDataExplorerMetricValue(row *table.Row) (float64, error) {
 	if row == nil || len(row.ColumnTypes) == 0 {
 		return -1, fmt.Errorf("query has no results")
 	}
@@ -141,14 +141,14 @@ func extractDataExplorerMetricValue(row *table.Row) (int64, error) {
 		return -1, fmt.Errorf("data type %s is not valid", dataType)
 	}
 
-	value, err := strconv.Atoi(row.Values[0].String())
+	value, err := strconv.ParseFloat(row.Values[0].String(), 64)
 	if err != nil {
 		return -1, fmt.Errorf("failed to convert result %s to int", row.Values[0].String())
 	}
 	if value < 0 {
-		return -1, fmt.Errorf("query result must be >= 0 but received: %d", value)
+		return -1, fmt.Errorf("query result must be >= 0 but received: %f", value)
 	}
 
 	azureDataExplorerLogger.V(1).Info("Query Result", "value", value, "dataType", dataType)
-	return int64(value), nil
+	return value, nil
 }

pkg/scalers/azure/azure_monitor.go

@@ -19,7 +19,6 @@ package azure
 import (
 	"context"
 	"fmt"
-	"math"
 	"strconv"
 	"strings"
 	"time"
@@ -67,7 +66,7 @@ type MonitorInfo struct {
 var azureMonitorLog = logf.Log.WithName("azure_monitor_scaler")
 
 // GetAzureMetricValue returns the value of an Azure Monitor metric, rounded to the nearest int
-func GetAzureMetricValue(ctx context.Context, info MonitorInfo, podIdentity kedav1alpha1.PodIdentityProvider) (int64, error) {
+func GetAzureMetricValue(ctx context.Context, info MonitorInfo, podIdentity kedav1alpha1.PodIdentityProvider) (float64, error) {
 	client := createMetricsClient(ctx, info, podIdentity)
 	requestPtr, err := createMetricsRequest(info)
 	if err != nil {
@@ -128,16 +127,13 @@ func createMetricsRequest(info MonitorInfo) (*azureExternalMetricRequest, error)
 	return &metricRequest, nil
 }
 
-func executeRequest(ctx context.Context, client insights.MetricsClient, request *azureExternalMetricRequest) (int64, error) {
+func executeRequest(ctx context.Context, client insights.MetricsClient, request *azureExternalMetricRequest) (float64, error) {
 	metricResponse, err := getAzureMetric(ctx, client, *request)
 	if err != nil {
 		return -1, fmt.Errorf("error getting azure monitor metric %s: %w", request.MetricName, err)
 	}
 
-	// casting drops everything after decimal, so round first
-	metricValue := int64(math.Round(metricResponse))
-
-	return metricValue, nil
+	return metricResponse, nil
 }
 
 func getAzureMetric(ctx context.Context, client insights.MetricsClient, azMetricRequest azureExternalMetricRequest) (float64, error) {