matrix-docker-ansible-deploy/roles/custom/matrix-prometheus-postgres-exporter/tasks/init.yml

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---
- when: matrix_prometheus_node_exporter_enabled | bool and matrix_prometheus_node_exporter_metrics_proxying_enabled | bool
block:
- name: Fail if matrix-nginx-proxy role already executed
ansible.builtin.fail:
msg: >-
Trying to append postgres-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-postgres-exporter role.
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when: matrix_nginx_proxy_role_executed | default(False) | bool
- name: Generate postgres-exporter metrics proxying configuration for matrix-nginx-proxy (matrix.DOMAIN/metrics/postgres-exporter)
ansible.builtin.set_fact:
matrix_prometheus_postgres_exporter_nginx_metrics_configuration_block: |
location /metrics/postgres-exporter {
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{% 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 $backend "matrix-prometheus-postgres-exporter:9187";
proxy_pass http://$backend/metrics;
{% elif matrix_prometheus_postgres_exporter_matrix_nginx_proxy_not_enabled_proxy_pass_host != '' %}
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 %}
}
- 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: |
{{
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matrix_nginx_proxy_proxy_matrix_metrics_additional_system_location_configuration_blocks | default([])
+
[matrix_prometheus_postgres_exporter_nginx_metrics_configuration_block]
}}