Record whether a node is adopted and which modules were taken on it (hq ADR 0100)

cmd/mesh-controller/readable.go

@@ -54,6 +54,8 @@ type meshStatus struct {
 	// Machines is how many the mesh knows about, so a reader can tell "none wrong" from
 	// "none at all".
 	Machines int `json:"machines"`
+	// Adopted is every node still adopted (novox/hq ADR 0100); absent when none is.
+	Adopted []string `json:"adopted,omitempty"`
 }
 
 type machineUnresolved struct {
@@ -133,7 +135,7 @@ func statusAsJSON(asked answers) ([]byte, error) {
 	out := meshStatus{Machines: len(nodes), Wrong: []machineDoing{},
 		Quiet: []machineQuiet{}, Behind: []moduleBehind{}, Waiting: []machineWaiting{},
 		Reported: []machineReported{}, Unresolved: []machineUnresolved{},
-		Network: asked.network}
+		Network: asked.network, Adopted: adoptedNodes(nodes)}
 	for name := range asked.refused {
 		out.Unresolved = append(out.Unresolved, machineUnresolved{
 			Node: name, Problem: asked.refused[name]})