show number of partitions per target

partition/debug.go

@@ -55,6 +55,7 @@ Versions:
    <th>Host</th>
    <th>Version</th>
    <th>Stamp</th>
+   <th>#Part</th>
    <th>#Items</th>
   </tr>
  </thead>
@@ -62,9 +63,14 @@ Versions:
  {{range $s := .GlobalStatus.Sort}}
   <tr>
    <td><a href="{{$s.Target | httpize}}/debug/part/{{.Name}}">{{$s.Target}}</a></td>
+   {{if $s.Err}}
+   <td colspan="4">{{$s.Err}}</td>
+   {{else}}
    <td>{{$s.Version}}</td>
    <td>{{$s.Stamp}}</td>
+   <td>{{$s.Partitions}}</td>
    <td>{{$s.Total}}</td>
+   {{end}}
   </tr>
  {{end}}
  </tbody>

partition/status.go

@@ -25,6 +25,10 @@ func (s PartitionStatus) Total() int {
 	return total
 }
 
+func (s PartitionStatus) Partitions() int {
+	return len(s.Counters)
+}
+
 type statusMap map[string]*PartitionStatus
 
 func (m statusMap) AllVersions() []string {