Adds metadata attribute

common/src/main/java/com/netflix/conductor/common/metadata/workflow/WorkflowDef.java

@@ -106,6 +106,9 @@ public enum TimeoutPolicy {
     @ProtoField(id = 21)
     private boolean enforceSchema = true;
 
+    @ProtoField(id = 22)
+    private Map<String, Object> metadata = new HashMap<>();
+
     public boolean isEnforceSchema() {
         return enforceSchema;
     }
@@ -366,6 +369,14 @@ public void setOutputSchema(SchemaDef outputSchema) {
         this.outputSchema = outputSchema;
     }
 
+    public Map<String, Object> getMetadata() {
+        return metadata;
+    }
+
+    public void setMetadata(Map<String, Object> metadata) {
+        this.metadata = metadata;
+    }
+
     public boolean containsType(String taskType) {
         return collectTasks().stream().anyMatch(t -> t.getType().equals(taskType));
     }

grpc/src/main/java/com/netflix/conductor/grpc/AbstractProtoMapper.java

@@ -1339,6 +1339,9 @@ public WorkflowDefPb.WorkflowDef toProto(WorkflowDef from) {
             to.setOutputSchema( toProto( from.getOutputSchema() ) );
         }
         to.setEnforceSchema( from.isEnforceSchema() );
+        for (Map.Entry<String, Object> pair : from.getMetadata().entrySet()) {
+            to.putMetadata( pair.getKey(), toProto( pair.getValue() ) );
+        }
         return to.build();
     }
 
@@ -1382,6 +1385,11 @@ public WorkflowDef fromProto(WorkflowDefPb.WorkflowDef from) {
             to.setOutputSchema( fromProto( from.getOutputSchema() ) );
         }
         to.setEnforceSchema( from.getEnforceSchema() );
+        Map<String, Object> metadataMap = new HashMap<String, Object>();
+        for (Map.Entry<String, Value> pair : from.getMetadataMap().entrySet()) {
+            metadataMap.put( pair.getKey(), fromProto( pair.getValue() ) );
+        }
+        to.setMetadata(metadataMap);
         return to;
     }
 

grpc/src/main/proto/model/workflowdef.proto

@@ -35,4 +35,5 @@ message WorkflowDef {
     SchemaDef input_schema = 19;
     SchemaDef output_schema = 20;
     bool enforce_schema = 21;
+    map<string, google.protobuf.Value> metadata = 22;
 }