add field to capability response metadata to convey the total number … (#1574)

* add field to capability response metadata to convey the total number of don participants

* update property for better clarity and add to helpers

Author: EasterTheBunny

pkg/capabilities/capabilities.go

@@ -74,6 +74,7 @@ type CapabilityResponse struct {
 
 type ResponseMetadata struct {
 	Metering []MeteringNodeDetail
+	CapDON_N uint32
 }
 
 type MeteringNodeDetail struct {

pkg/capabilities/pb/capabilities.pb.go

@@ -127,6 +127,8 @@ message ResponseMetadata {
   // If you are working with this in a capability, you should not emit
   // more than one metering report per node.
   repeated metering.MeteringReportNodeDetail metering = 1;
+  // capdon_n represents the total number of nodes in a capability don.
+  uint32 capdon_n = 2;
 }
 
 message RegistrationMetadata {

pkg/capabilities/pb/capabilities.proto

@@ -90,6 +90,7 @@ func CapabilityResponseToProto(resp capabilities.CapabilityResponse) *Capability
 		Value: values.ProtoMap(resp.Value),
 		Metadata: &ResponseMetadata{
 			Metering: metering,
+			CapdonN:  resp.Metadata.CapDON_N,
 		},
 		Payload: resp.Payload,
 	}
@@ -166,6 +167,7 @@ func CapabilityResponseFromProto(pr *CapabilityResponse) (capabilities.Capabilit
 		Value: val,
 		Metadata: capabilities.ResponseMetadata{
 			Metering: metering,
+			CapDON_N: pr.Metadata.GetCapdonN(),
 		},
 		Payload: pr.Payload,
 	}