Remove redundant labels (CrunchyData#159)

Issue: [sc-16148]

Author: benjaminjb

kustomize/monitoring/prometheus-config.yaml

@@ -62,15 +62,6 @@ data:
         target_label: role
         replacement: '$1'
         separator: ""
-      - source_labels: [dbname]
-        target_label: dbname
-        replacement: '$1'
-      - source_labels: [relname]
-        target_label: relname
-        replacement: '$1'
-      - source_labels: [schemaname]
-        target_label: schemaname
-        replacement: '$1'
 
     rule_files:
       - /etc/prometheus/alert-rules.d/*.yml