Add Prometheus monitoring metrics into logscraper

We would like to know statistics of processed jobs.
It might help us to estimate storage usage on Opensearch service.

Change-Id: Iae7e2fa7a5ed6d09855a2cb042ce68f7152f9cbc

ansible/playbooks/deploy-services.yml

@@ -23,6 +23,7 @@
         logsender_wait_time: 10
         skip_debug: true
         performance_index_prefix: "performance-"
+        monitoring_port: 9128
   roles:
     - logscraper
     - logsender
@@ -44,3 +45,10 @@
         state: enabled
         permanent: true
         immediate: true
+
+    - name: Expose Prometheus Logscraper exporter metrics for softwarefactory-project.io
+      firewalld:
+        rich_rule: 'rule family=ipv4 source address=38.102.83.250/32 port port=9128 protocol=tcp accept'
+        state: enabled
+        permanent: true
+        immediate: true

ansible/roles/logscraper/defaults/main.yml

@@ -31,4 +31,5 @@ container_images:
 #     debug: true
 #     logscraper_wait_time: 120
 #     custom_ca_crt: ""
+#     monitoring_port: ""
 tenant_builds: []

ansible/roles/logscraper/templates/config.yaml.j2

@@ -11,6 +11,7 @@ directory: {{ item['download_dir'] | default('/tmp/logscraper') }}
 wait_time: {{ item['logscraper_wait_time'] | default(120) }}
 insecure: {{ item['insecure'] | default(false) }}
 ca_file: {{ item['custom_ca_crt'] | default('') }}
+monitoring_port: {{ item['monitoring_port'] | default('') }}
 #deprecated
 gearman_server: {{ item['gearman_server'] | default('') }}
 gearman_port: {{ item['gearman_port'] | default(4730) }}