Make sure to use the right variable in the init.yml files

roles/matrix-prometheus-node-exporter/tasks/init.yml

@@ -24,7 +24,7 @@
               set $backend "matrix-prometheus-node-exporter:9100";
               proxy_pass http://$backend/metrics;
             {% elif matrix_prometheus_postgres_exporter_container_http_host_bind_port != '' %}
-              proxy_pass http://{{ matrix_prometheus_postgres_exporter_container_http_host_bind_port }}/metrics;
+              proxy_pass http://{{ matrix_prometheus_node_exporter_matrix_nginx_proxy_not_enabled_proxy_pass_host }}/metrics;
             {% else %}
               return 404 "matrix-nginx-proxy is disabled and no host port was bound to the container, so metrics are unavailable";
             {% endif %}

roles/matrix-prometheus-postgres-exporter/tasks/init.yml

@@ -24,7 +24,7 @@
               set $backend "matrix-prometheus-postgres-exporter:9187";
               proxy_pass http://$backend/metrics;
             {% elif matrix_prometheus_node_exporter_container_http_host_bind_port != '' %}
-              proxy_pass http://{{ matrix_prometheus_node_exporter_container_http_host_bind_port }}/metrics;
+              proxy_pass http://{{ matrix_prometheus_postgres_exporter_matrix_nginx_proxy_not_enabled_proxy_pass_host }}/metrics;
             {% else %}
               return 404 "matrix-nginx-proxy is disabled and no host port was bound to the container, so metrics are unavailable";
             {% endif %}