feat: return flag metadata as well

core/pkg/evaluator/json.go

@@ -327,6 +327,13 @@ func (je *Resolver) evaluateVariant(ctx context.Context, reqID string, flagKey s
 		metadata[SelectorMetadataKey] = selector
 	}
 
+	for key, value := range flag.MetaData {
+		// If value is not nil or empty, copy to metadata
+		if value != nil {
+			metadata[key] = value
+		}
+	}
+
 	if flag.State == Disabled {
 		je.Logger.DebugWithID(reqID, fmt.Sprintf("requested flag is disabled: %s", flagKey))
 		return "", flag.Variants, model.ErrorReason, metadata, errors.New(model.FlagDisabledErrorCode)
@@ -460,11 +467,26 @@ func configToFlags(log *logger.Logger, config string, newFlags *Flags) error {
 		return fmt.Errorf("transposing evaluators: %w", err)
 	}
 
-	err = json.Unmarshal([]byte(transposedConfig), &newFlags)
+	var configData ConfigWithMetadata
+	err = json.Unmarshal([]byte(transposedConfig), &configData)
 	if err != nil {
 		return fmt.Errorf("unmarshalling provided configurations: %w", err)
 	}
 
+	// Assign the flags from the unmarshalled config to the newFlags struct
+	newFlags.Flags = configData.Flags
+
+	// Assign metadata as a map to each flag's metadata
+	for key, flag := range newFlags.Flags {
+		if flag.MetaData == nil {
+			flag.MetaData = make(map[string]interface{})
+		}
+		for metaKey, metaValue := range configData.MetaData {
+			flag.MetaData[metaKey] = metaValue
+		}
+		newFlags.Flags[key] = flag
+	}
+
 	return validateDefaultVariants(newFlags)
 }
 

core/pkg/evaluator/json_model.go

@@ -10,6 +10,11 @@ type Evaluators struct {
 	Evaluators map[string]json.RawMessage `json:"$evaluators"`
 }
 
+type ConfigWithMetadata struct {
+	Flags    map[string]model.Flag  `json:"flags"`
+	MetaData map[string]interface{} `json:"metadata"`
+}
+
 type Flags struct {
 	Flags map[string]model.Flag `json:"flags"`
 }

core/pkg/model/flag.go

@@ -3,12 +3,13 @@ package model
 import "encoding/json"
 
 type Flag struct {
-	State          string          `json:"state"`
-	DefaultVariant string          `json:"defaultVariant"`
-	Variants       map[string]any  `json:"variants"`
-	Targeting      json.RawMessage `json:"targeting,omitempty"`
-	Source         string          `json:"source"`
-	Selector       string          `json:"selector"`
+	State          string                 `json:"state"`
+	DefaultVariant string                 `json:"defaultVariant"`
+	Variants       map[string]any         `json:"variants"`
+	Targeting      json.RawMessage        `json:"targeting,omitempty"`
+	Source         string                 `json:"source"`
+	Selector       string                 `json:"selector"`
+	MetaData       map[string]interface{} `json:"metadata"`
 }
 
 type Evaluators struct {

core/pkg/store/flags.go

@@ -22,6 +22,7 @@ type Flags struct {
 	Flags          map[string]model.Flag `json:"flags"`
 	FlagSources    []string
 	SourceMetadata map[string]SourceDetails
+	MetaData       map[string]interface{} `json:"metadata"`
 }
 
 type SourceDetails struct {