prometheus: Add Gentoo support

prometheus/tasks/main.yml

@@ -5,6 +5,16 @@
     name:
       - prometheus
     state: present
+  when: ansible_distribution_file_variety == "Debian"
+  tags:
+    - prometheus
+
+- name: Install prometheus
+  portage:
+    package:
+      - app-metrics/prometheus
+    state: present
+  when: ansible_distribution == "Gentoo"
   tags:
     - prometheus
 
@@ -14,6 +24,18 @@
     dest: /etc/default/prometheus
   notify:
     - Restart prometheus
+  when: ansible_distribution_file_variety == "Debian"
+  tags:
+    - prometheus
+    - config
+
+- name: Configure prometheus command arguments
+  template:
+    src: confd-prometheus.j2
+    dest: /etc/conf.d/prometheus
+  notify:
+    - Restart prometheus
+  when: ansible_distribution == "Gentoo"
   tags:
     - prometheus
     - config

prometheus/templates/confd-prometheus.j2

+# arguments for Prometheus
+command_args="{{ prometheus_args }}"
+supervisor="supervise-daemon"