Add extra disks to system table (#1365)

internal/entities/system/system.go

@@ -99,6 +99,11 @@ type FsStats struct {
 	MaxDiskWriteBytes uint64 `json:"wbm,omitempty" cbor:"-"`
 }
 
+// ExtraFsInfo contains summary info for extra filesystems in the system info
+type ExtraFsInfo struct {
+	DiskPct float64 `json:"dp" cbor:"0,keyasint"`
+}
+
 type NetIoStats struct {
 	BytesRecv uint64
 	BytesSent uint64
@@ -146,6 +151,7 @@ type Info struct {
 	// TODO: remove load fields in future release in favor of load avg array
 	LoadAvg        [3]float64     `json:"la,omitempty" cbor:"19,keyasint"`
 	ConnectionType ConnectionType `json:"ct,omitempty" cbor:"20,keyasint,omitempty,omitzero"`
+	ExtraFsPct     map[string]ExtraFsInfo `json:"efsp,omitempty" cbor:"21,keyasint,omitempty"`
 }
 
 // Final data structure to return to the hub