add the ansible playbooks for the monitoring stack

ansible/roles/prometheus/tasks/main.yml

@@ -0,0 +1,82 @@
+---
+- name: Create Prometheus directories
+  ansible.builtin.file:
+    path: "{{ item }}"
+    state: directory
+    owner: monitoring
+    group: monitoring
+    mode: "0755"
+  loop:
+    - /etc/prometheus
+    - /var/lib/prometheus
+
+- name: Check if Prometheus is installed
+  ansible.builtin.stat:
+    path: /usr/local/bin/prometheus
+  register: prometheus_binary
+
+- name: Get installed Prometheus version
+  ansible.builtin.command: /usr/local/bin/prometheus --version
+  register: prometheus_installed_version
+  changed_when: false
+  failed_when: false
+  when: prometheus_binary.stat.exists
+
+- name: Download Prometheus
+  ansible.builtin.get_url:
+    url: "https://github.com/prometheus/prometheus/releases/download/v{{ prometheus_version }}/prometheus-{{ prometheus_version }}.linux-{{ go_arch }}.tar.gz"
+    dest: "/tmp/prometheus-{{ prometheus_version }}.tar.gz"
+    mode: "0644"
+  when: not prometheus_binary.stat.exists or prometheus_version not in (prometheus_installed_version.stdout | default(''))
+
+- name: Extract Prometheus
+  ansible.builtin.unarchive:
+    src: "/tmp/prometheus-{{ prometheus_version }}.tar.gz"
+    dest: /tmp
+    remote_src: true
+  when: not prometheus_binary.stat.exists or prometheus_version not in (prometheus_installed_version.stdout | default(''))
+
+- name: Install Prometheus binaries
+  ansible.builtin.copy:
+    src: "/tmp/prometheus-{{ prometheus_version }}.linux-{{ go_arch }}/{{ item }}"
+    dest: "/usr/local/bin/{{ item }}"
+    mode: "0755"
+    remote_src: true
+  loop:
+    - prometheus
+    - promtool
+  notify: Restart prometheus
+  when: not prometheus_binary.stat.exists or prometheus_version not in (prometheus_installed_version.stdout | default(''))
+
+- name: Deploy Prometheus configuration
+  ansible.builtin.template:
+    src: prometheus.yml.j2
+    dest: /etc/prometheus/prometheus.yml
+    owner: monitoring
+    group: monitoring
+    mode: "0644"
+  notify: Restart prometheus
+
+- name: Deploy Prometheus systemd service
+  ansible.builtin.template:
+    src: prometheus.service.j2
+    dest: /etc/systemd/system/prometheus.service
+    mode: "0644"
+  notify:
+    - Reload systemd
+    - Restart prometheus
+
+- name: Enable and start Prometheus
+  ansible.builtin.systemd:
+    name: prometheus
+    enabled: true
+    state: started
+    daemon_reload: true
+
+- name: Clean up downloaded files
+  ansible.builtin.file:
+    path: "{{ item }}"
+    state: absent
+  loop:
+    - "/tmp/prometheus-{{ prometheus_version }}.tar.gz"
+    - "/tmp/prometheus-{{ prometheus_version }}.linux-{{ go_arch }}"