Add prometheus for metrics

ansible/roles/forrest/files/docker-compose-prometheus.yml

@@ -0,0 +1,21 @@
+version: "2.3"
+
+services:
+  prometheus:
+    image: prom/prometheus:latest
+    restart: unless-stopped
+    volumes:
+      - ./prometheus.yml:/etc/prometheus/prometheus.yml
+      - /mnt/tank/dbs/prometheus/forrest/:/prometheus/
+    networks:
+      - default
+      - prometheus
+      - grafana
+    ports:
+      - "{{ protected_ip }}:9090:9090"
+
+networks:
+  prometheus:
+    external: true
+  grafana:
+    external: true

ansible/roles/forrest/handlers/main.yml

@@ -7,3 +7,8 @@
   shell:
     chdir: /opt/influxdb
     cmd: "{{ docker_update_command }}"
+
+- name: restart prometheus
+  shell:
+    chdir: /opt/prometheus
+    cmd: "{{ docker_update_command }}"

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