feat: Add Prometheus installation role and playbook

- Created Prometheus role with automated installation
- Version: 2.48.1
- Configured remote_write to VictoriaMetrics (192.168.0.104:8428)
- Added scrape configs for monitoring infrastructure
- Created systemd service configuration
- Successfully tested on 192.168.0.105

roles/prometheus/tasks/main.yml

@@ -0,0 +1,121 @@
+---
+- name: Create prometheus system user
+  user:
+    name: "{{ prometheus_user }}"
+    shell: /bin/false
+    home: /nonexistent
+    create_home: no
+    system: yes
+    state: present
+
+- name: Create prometheus directories
+  file:
+    path: "{{ item }}"
+    state: directory
+    owner: "{{ prometheus_user }}"
+    group: "{{ prometheus_group }}"
+    mode: '0755'
+  loop:
+    - "{{ prometheus_config_dir }}"
+    - "{{ prometheus_config_dir }}/rules"
+    - "{{ prometheus_config_dir }}/file_sd"
+    - "{{ prometheus_data_dir }}"
+
+- name: Check if Prometheus is already installed
+  stat:
+    path: "{{ prometheus_binary_dir }}/prometheus"
+  register: prometheus_binary
+
+- name: Check Prometheus version
+  shell: "{{ prometheus_binary_dir }}/prometheus --version 2>&1 | head -1 | awk '{print $3}'"
+  register: prometheus_installed_version
+  when: prometheus_binary.stat.exists
+  changed_when: false
+  failed_when: false
+
+- name: Download and install Prometheus
+  block:
+    - name: Download Prometheus {{ prometheus_version }}
+      unarchive:
+        src: "https://github.com/prometheus/prometheus/releases/download/v{{ prometheus_version }}/prometheus-{{ prometheus_version }}.linux-amd64.tar.gz"
+        dest: /tmp
+        remote_src: yes
+        owner: root
+        group: root
+        mode: '0755'
+
+    - name: Copy Prometheus binaries
+      copy:
+        src: "/tmp/prometheus-{{ prometheus_version }}.linux-amd64/{{ item }}"
+        dest: "{{ prometheus_binary_dir }}/{{ item }}"
+        owner: root
+        group: root
+        mode: '0755'
+        remote_src: yes
+      loop:
+        - prometheus
+        - promtool
+      notify: restart prometheus
+
+    - name: Copy console libraries
+      copy:
+        src: "/tmp/prometheus-{{ prometheus_version }}.linux-amd64/{{ item }}/"
+        dest: "{{ prometheus_config_dir }}/{{ item }}/"
+        owner: "{{ prometheus_user }}"
+        group: "{{ prometheus_group }}"
+        remote_src: yes
+      loop:
+        - consoles
+        - console_libraries
+
+    - name: Clean up downloaded files
+      file:
+        path: "/tmp/prometheus-{{ prometheus_version }}.linux-amd64"
+        state: absent
+  when: not prometheus_binary.stat.exists or (prometheus_installed_version.stdout != prometheus_version)
+
+- name: Configure Prometheus
+  template:
+    src: prometheus.yml.j2
+    dest: "{{ prometheus_config_dir }}/prometheus.yml"
+    owner: "{{ prometheus_user }}"
+    group: "{{ prometheus_group }}"
+    mode: '0644'
+    backup: yes
+    validate: "{{ prometheus_binary_dir }}/promtool check config %s"
+  notify: reload prometheus
+
+- name: Create Prometheus systemd service
+  template:
+    src: prometheus.service.j2
+    dest: /etc/systemd/system/prometheus.service
+    mode: '0644'
+  notify: restart prometheus
+
+- name: Ensure Prometheus is started and enabled
+  systemd:
+    name: prometheus
+    state: started
+    enabled: yes
+    daemon_reload: yes
+
+- name: Wait for Prometheus to be ready
+  uri:
+    url: "http://localhost:{{ prometheus_port }}/metrics"
+    status_code: 200
+  register: prometheus_health
+  until: prometheus_health.status == 200
+  retries: 10
+  delay: 5
+
+- name: Check Prometheus targets status
+  uri:
+    url: "http://localhost:{{ prometheus_port }}/api/v1/targets"
+  register: targets_response
+
+- name: Display Prometheus status
+  debug:
+    msg:
+      - "Prometheus version: {{ prometheus_version }}"
+      - "Prometheus URL: http://{{ ansible_host }}:{{ prometheus_port }}"
+      - "Active targets: {{ targets_response.json.data.activeTargets | length }}"