Aligned common GS Prometheus queries

Change-Id: I9a0b444590101494d0c1647b7b3395a9718fa16c
Closes-Bug: PROD-27903
(cherry picked from commit f05055979bdf15c8001a8fab1700fdb71eea2856)
diff --git a/prometheus/gainsight/query/openstack.yml b/prometheus/gainsight/query/openstack.yml
index 877ad32..40a804b 100644
--- a/prometheus/gainsight/query/openstack.yml
+++ b/prometheus/gainsight/query/openstack.yml
@@ -8,7 +8,7 @@
         vstorage_free: "'vStorage Free','avg(sum(avg_over_time(openstack_nova_free_disk[24h])) by (instance))'"
         vram_used: "'vRAM Used','avg(sum(avg_over_time(openstack_nova_used_ram[24h])) by (instance))'"
         vram_free: "'vRAM Free','avg(sum(avg_over_time(openstack_nova_free_ram[24h])) by (instance))'"
-        instances: "'Active Instances','avg(sum(avg_over_time(openstack_nova_instances{state=\"active\"}[24h])) by (instance))'"
+        instances: "'Instances','avg(sum(avg_over_time(openstack_nova_instances{state=\"active\"}[24h])) by (instance))'"
         compute_nodes: "'Compute Nodes','avg(sum(openstack_nova_services{binary=~\"nova.compute\"}) by (instance))'"
         tenants: "'Tenants','avg(sum(avg_over_time(openstack_keystone_tenants_total[24h])) by (instance))'"
         cinder_api: "'Cinder API','avg(avg_over_time(openstack_api_check_status{name=\"cinderv2\"}[24h]))'"