feat(api): label Postgres connections with application_name per component and alias (#11494)

api/docker-entrypoint.sh

@@ -68,6 +68,15 @@ manage_db_partitions() {
   fi
 }
 
+# Identify this process to Postgres (application_name=<component>:<alias>) so
+# connections are attributable by component in pg_stat_activity. Web tiers
+# report "api"; everything else uses the launch subcommand.
+case "$1" in
+  prod|dev) DJANGO_APP_COMPONENT="api" ;;
+  *)        DJANGO_APP_COMPONENT="$1" ;;
+esac
+export DJANGO_APP_COMPONENT
+
 case "$1" in
   dev)
     apply_migrations