Fix cluster.stats Response (#697)

Author: philkra

output/schema/schema.json

@@ -227,7 +227,7 @@ export class ClusterOperatingSystem {
   available_processors: integer
   mem: OperatingSystemMemoryInfo
   names: ClusterOperatingSystemName[]
-  pretty_names: ClusterOperatingSystemName[]
+  pretty_names: ClusterOperatingSystemPrettyName[]
   architectures?: ClusterOperatingSystemArchitecture[]
 }
 
@@ -236,6 +236,11 @@ export class ClusterOperatingSystemName {
   name: Name
 }
 
+export class ClusterOperatingSystemPrettyName {
+  count: integer
+  pretty_name: Name
+}
+
 export class ClusterProcess {
   cpu: ClusterProcessCpu
   open_file_descriptors: ClusterProcessOpenFileDescriptors