---

- name: Generate postgres-exporter metrics proxying configuration for matrix-nginx-proxy (matrix.DOMAIN/metrics/postgres-exporter)
  ansible.builtin.set_fact:
    matrix_prometheus_services_proxy_connect_postgres_exporter_nginx_metrics_configuration_block: |
      location /metrics/postgres-exporter {
        {% if matrix_nginx_proxy_enabled | default(False) %}
          {# Use the embedded DNS resolver in Docker containers to discover the service #}
          resolver 127.0.0.11 valid=5s;
          set $backend "{{ prometheus_postgres_exporter_identifier }}:{{ prometheus_postgres_exporter_port }}";
          proxy_pass http://$backend/metrics;
        {% elif matrix_prometheus_services_proxy_connect_prometheus_postgres_exporter_matrix_nginx_proxy_not_enabled_proxy_pass_host != '' %}
          proxy_pass http://{{ matrix_prometheus_services_proxy_connect_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 %}
      }

- name: Register postgres-exporter metrics proxying configuration with matrix-nginx-proxy (matrix.DOMAIN/metrics/postgres-exporter)
  ansible.builtin.set_fact:
    matrix_nginx_proxy_proxy_matrix_metrics_additional_system_location_configuration_blocks: |
      {{
        matrix_nginx_proxy_proxy_matrix_metrics_additional_system_location_configuration_blocks | default([])
        +
        [matrix_prometheus_services_proxy_connect_postgres_exporter_nginx_metrics_configuration_block]
      }}