diff --git a/playbooks/prod_web.yml b/playbooks/prod_web.yml
index 4ac2a57..51bbe80 100755
--- a/playbooks/prod_web.yml
+++ b/playbooks/prod_web.yml
@@ -253,6 +253,10 @@
           - name: PSQL Connections
             command: "check_by_ssh!/usr/lib/nagios/plugins/check_pgsql -H localhost -l nagios -p {{ secret_postgresql_monitoring_password }} -w 2 -c 5 -q 'select (select count(*)::float used from pg_stat_activity) / (select setting::int max_conn from pg_settings where name=\\$\\$max_connections\\$\\$)' -W 0.7-0.8 -C 0.8-1.0"
             hostgroup: tag-nagios-checkpgsql
+            # https://rhaas.blogspot.com/2020/02/useless-vacuuming.html
+          - name: PSQL Old Xacts
+            command: "check_by_ssh!/usr/lib/nagios/plugins/check_pgsql -H localhost -l nagios -p {{ secret_postgresql_monitoring_password }} -w 2 -c 5 -q 'select count(*)::float from pg_prepared_xacts where age(transaction) > 5000000' -C 1-1000000"
+            hostgroup: tag-nagios-checkpgsql
           - name: Unit postgresql.service
             command: check_by_ssh!/usr/local/bin/monitoring-scripts/check_systemd_unit postgresql.service
             hostgroup: tag-nagios-checkpgsql