add prometheus scraper for jobportal busniess metrics provided by n8n

roles/prometheus/README.md

@@ -74,7 +74,7 @@ And include it in your playbook.
 
 ## Docs
 
-### Predefined srape configs
+### Predefined scrape configs
 
 The `prometheus.yml` template contains predefined srcape jobs that lookup proxy configurations of `prometheus_hosts` in the Ansible inventory.
 
@@ -90,6 +90,24 @@ The `prometheus.yml` template contains predefined srcape jobs that lookup proxy
 * **n8n https**: Targets are `nginx_proxies` with exporter `n8n`.
 * **blackbox**: Targets are `nginx_proxies` with `monitor` not false and host is `blackbox01:9115`.
 
+### Custom scrapers
+
+override the variable `prometheus_custom_scrapers` 
+example:
+```
+prometheus_custom_scrapers: |
+  - job_name: n8n business metrics https
+    metrics_path: "/webhook/metrics"
+    scrape_interval: 60s
+    honor_labels: true
+    scheme: https
+    basic_auth:
+      username: {{ prometheus_n8n_business_metrics_username }}
+      password: {{ prometheus_n8n_business_metrics_password }}
+    static_configs:
+      - targets: ['n8n.example.com']
+```
+
 ### Deploy Prometheus container
 
 Select multiple inventories when deploying.

roles/prometheus/defaults/main.yml

@@ -19,6 +19,7 @@ prometheus_n8n_exporter_proxy_basic_auth_password: "'{{ vault_prometheus_n8n_exp
 prometheus_meilisearch_exporter_api_key: "{{ vault_prometheus_meilisearch_exporter_api_key }}"
 prometheus_alerting: {}
 prometheus_rules: {}
+prometheus_custom_scrapers: ""
   # system.yml: |
   #   {% raw %}
   #   groups:

roles/prometheus/templates/prometheus.yml

@@ -139,7 +139,6 @@ scrape_configs:
       - target_label: __address__
         replacement: {{ blackbox_exporter_hostname }}:9115
 {% endif %}
-
 {% if prometheus_n8n_exporter_proxy_basic_auth_username is defined %}
   - job_name: n8n https
     metrics_path: "/n8n-exporter/metrics"
@@ -164,3 +163,4 @@ scrape_configs:
     static_configs:
       - targets: {{ prometheus_hosts | map('extract', hostvars) | json_query('[*].nginx_proxies[?exporter!=null && contains(exporter, `meilisearch`)].src_hostname') | flatten }}
 {% endif %}
+  {{ prometheus_custom_scrapers | indent(2) }}