Add prometheus for metrics

ansible/roles/forrest/tasks/main.yml

@@ -3,3 +3,6 @@
 
 - name: InfluxDB
   include: influxdb.yml
+
+- name: Prometheus
+  include: prometheus.yml

ansible/roles/forrest/tasks/prometheus.yml

@@ -0,0 +1,21 @@
+- name: Create network
+  docker_network:
+    name: prometheus
+
+- name: Create prometheus install directory
+  file:
+    path: /opt/prometheus
+    state: directory
+    owner: "{{ docker_user.name }}"
+    mode: "{{ docker_compose_directory_mask }}"
+  become: true
+
+- name: Install prometheus compose file
+  template:
+    src: files/docker-compose-prometheus.yml
+    dest: /opt/prometheus/docker-compose.yml
+    mode: "{{ docker_compose_file_mask }}"
+    owner: "{{ docker_user.name }}"
+    validate: docker-compose -f %s config
+  notify: restart prometheus
+  become: true