Remove hostname for global hypervisor metrics

Change-Id: Ic66523d4d54465947699833c5e9a5a7d99f60388
diff --git a/collectd/files/plugin/hypervisor_stats.py b/collectd/files/plugin/hypervisor_stats.py
index 5fc3bdb..7d1696f 100644
--- a/collectd/files/plugin/hypervisor_stats.py
+++ b/collectd/files/plugin/hypervisor_stats.py
@@ -140,6 +140,7 @@
                     'meta': {
                         'aggregate': agg,
                         'aggregate_id': agg_id,
+                        'meta': {'discard_hostname': True}
                     }
                 }
         # Dispatch the global metrics
@@ -147,6 +148,7 @@
             yield {
                 'type_instance': 'total_{}'.format(k),
                 'values': v,
+                'meta': {'discard_hostname': True}
             }
 
 plugin = HypervisorStatsPlugin(collectd, PLUGIN_NAME,