diff --git a/puppet/zulip_internal/files/nagios3/conf.d/services.cfg b/puppet/zulip_internal/files/nagios3/conf.d/services.cfg
index 75d49c3654..f2fe2f31e3 100644
--- a/puppet/zulip_internal/files/nagios3/conf.d/services.cfg
+++ b/puppet/zulip_internal/files/nagios3/conf.d/services.cfg
@@ -237,7 +237,7 @@ define service {
         use                             generic-service
         service_description             Check postgres autovac_freeze
         check_command                   check_postgres!wiki,trac!zulip!autovac_freeze
-        host                            trac
+        hostgroup                       postgres_other
         contact_groups                  admins
 }
 
@@ -245,7 +245,7 @@ define service {
         use                             generic-service
         service_description             Check postgres connection
         check_command                   check_postgres!wiki,trac!zulip!connection
-        host                            trac
+        hostgroup                       postgres_other
         contact_groups                  admins
 }
 
@@ -253,7 +253,7 @@ define service {
         use                             generic-service
         service_description             Check postgres backends
         check_command                   check_postgres!wiki,trac!zulip!backends
-        host                            trac
+        hostgroup                       postgres_other
         contact_groups                  admins
 }
 
@@ -261,7 +261,7 @@ define service {
         use                             generic-service
         service_description             Check postgres disabled triggers
         check_command                   check_postgres!wiki,trac!zulip!disabled_triggers
-        host                            trac
+        hostgroup                       postgres_other
         contact_groups                  admins
 }
 
@@ -269,7 +269,7 @@ define service {
         use                             generic-service
         service_description             Check postgres hitratio
         check_command                   check_postgres!wiki,trac!zulip!hitratio
-        host                            trac
+        hostgroup                       postgres_other
         contact_groups                  admins
 }
 
@@ -277,7 +277,7 @@ define service {
         use                             generic-service
         service_description             Check postgres locks
         check_command                   check_postgres!wiki,trac!zulip!locks
-        host                            trac
+        hostgroup                       postgres_other
         contact_groups                  admins
 }
 
@@ -285,7 +285,7 @@ define service {
         use                             generic-service
         service_description             Check postgres timesync
         check_command                   check_postgres!wiki,trac!zulip!timesync
-        host                            trac
+        hostgroup                       postgres_other
         contact_groups                  admins
 }
 
@@ -293,7 +293,7 @@ define service {
         use                             generic-service
         service_description             Check postgres txn_time
         check_command                   check_postgres_alert_args!wiki,trac!zulip!txn_time!20 seconds!40 seconds
-        host                            trac
+        hostgroup                       postgres_other
         contact_groups                  admins
 }