--- - ansible.builtin.set_fact: matrix_systemd_services_list: "{{ matrix_systemd_services_list + ['matrix-prometheus-node-exporter.service'] }}" when: matrix_prometheus_node_exporter_enabled|bool - block: - name: Fail if matrix-nginx-proxy role already executed ansible.builtin.fail: msg: >- Trying to append node-exporter's reverse-proxying configuration to matrix-nginx-proxy, but it's pointless since the matrix-nginx-proxy role had already executed. To fix this, please change the order of roles in your playbook, so that the matrix-nginx-proxy role would run after the matrix-prometheus-node-exporter role. when: matrix_nginx_proxy_role_executed|default(False)|bool - name: Generate node-exporter metrics proxying configuration for matrix-nginx-proxy (matrix.DOMAIN/metrics/node-exporter) ansible.builtin.set_fact: matrix_prometheus_node_exporter_nginx_metrics_configuration_block: | location /metrics/node-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 $backend "matrix-prometheus-node-exporter:9100"; proxy_pass http://$backend/metrics; {% else %} {# Generic configuration for use outside of our container setup #} {# This may be implemented in the future. #} return 404 "matrix-nginx-proxy is disabled, so metrics are unavailable"; {% endif %} } - name: Register node-exporter metrics proxying configuration with matrix-nginx-proxy (matrix.DOMAIN/metrics/node-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_node_exporter_nginx_metrics_configuration_block] }} when: matrix_prometheus_node_exporter_enabled|bool and matrix_prometheus_node_exporter_metrics_proxying_enabled|bool