Topic/refactor grafana agent

roles/grafana_agent/defaults/main.yml

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+---
+grafana_agent_version: latest
+# grafana_agent_mode: "flow"
+grafana_agent_mode: "static"
+grafana_agent_package: "grafana-agent{% if grafana_agent_mode == 'flow' %}-flow{% endif %}{{ (grafana_agent_version != 'latest') | ternary('=' ~ grafana_agent_version, '') }}"
+grafana_agent_manage_repo: true
+grafana_agent_dependencies: []
+
+# Grafana Agent Apt Repository Configuration
+grafana_agent_apt_release_channel: stable
+grafana_agent_apt_arch: "{{ 'arm64' if ansible_architecture == 'aarch64' else 'amd64' }}"
+grafana_agent_apt_repo: "deb [arch={{ grafana_agent_apt_arch }} signed-by=/usr/share/keyrings/grafana.key] https://apt.grafana.com/ {{ grafana_agent_apt_release_channel }} main"
+grafana_agent_apt_key: "https://apt.grafana.com/gpg.key"
+
+# Grafana Agent Yum Repository Configuration
+grafana_agent_yum_repo: https://rpm.grafana.com
+grafana_agent_yum_key: https://rpm.grafana.com/gpg.key
+
+grafana_agent_user_group: grafana-agent
+
+grafana_agent_static_config:
+  server:
+    log_level: warn
+
+  metrics:
+    global:
+      scrape_interval: 1m
+    wal_directory: '/var/lib/grafana-agent'
+    configs:
+      # Example Prometheus scrape configuration to scrape the agent itself for metrics.
+      # This is not needed if the agent integration is enabled.
+      # - name: agent
+      #   host_filter: false
+      #   scrape_configs:
+      #     - job_name: agent
+      #       static_configs:
+      #         - targets: ['127.0.0.1:9090']
+
+  integrations:
+    agent:
+      enabled: true
+    node_exporter:
+      enabled: true
+      include_exporter_metrics: true
+      disable_collectors:
+        - "mdadm"
+
+grafana_agent_flow_config: |
+  logging {
+      level = "warn"
+  }
+
+  prometheus.exporter.unix "default" {
+      include_exporter_metrics = true
+      disable_collectors       = ["mdadm"]
+  }
+
+  prometheus.scrape "default" {
+      targets = concat(
+        prometheus.exporter.unix.default.targets,
+        [{
+          // Self-collect metrics
+          job         = "agent",
+          __address__ = "127.0.0.1:12345",
+        }],
+      )
+
+      forward_to = [
+      // TODO: components to forward metrics to (like prometheus.remote_write or
+      // prometheus.relabel).
+      ]
+  }

roles/grafana_agent/handlers/main.yml

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+---
+- name: Restart Grafana Agent with daemon reload
+  become: true
+  ansible.builtin.systemd:
+    name: grafana-agent{% if grafana_agent_mode == 'flow' %}-flow{% endif %}
+    state: restarted
+    daemon_reload: true
+
+- name: Restart Grafana Agent
+  become: true
+  ansible.builtin.systemd:
+    name: grafana-agent{% if grafana_agent_mode == 'flow' %}-flow{% endif %}
+    state: restarted
+
+- name: Reload Grafana Agent
+  become: true
+  ansible.builtin.systemd:
+    name: grafana-agent{% if grafana_agent_mode == 'flow' %}-flow{% endif %}
+    state: reloaded

roles/grafana_agent/molecule/default/converge.yml

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+---
+- name: Converge
+  hosts: all
+  gather_facts: true
+  roles:
+    - role: grafana_agent

roles/grafana_agent/molecule/default/molecule.yml

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+---

roles/grafana_agent/molecule/grafana-agent-flow/converge.yml

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+---
+- name: Converge
+  hosts: all
+  gather_facts: true
+  vars:
+    grafana_agent_mode: flow
+  roles:
+    - role: grafana_agent

roles/grafana_agent/molecule/grafana-agent-flow/molecule.yml

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+---

roles/grafana_agent/tasks/configure.yml

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+---
+- name: Create Grafana Agent config - static
+  when: grafana_agent_mode == 'static'
+  ansible.builtin.template:
+    src: grafana-agent-static.yaml.j2
+    dest: /etc/grafana-agent.yaml
+    owner: root
+    group: "{{ grafana_agent_user_group }}"
+    mode: "0640"
+  notify: Restart Grafana Agent
+
+- name: Create Grafana Agent config - flow
+  when: grafana_agent_mode == 'flow'
+  ansible.builtin.template:
+    src: grafana-agent-flow.river.j2
+    dest: /etc/grafana-agent-flow.river
+    owner: root
+    group: "{{ grafana_agent_user_group }}"
+    mode: "0640"
+  notify: Reload Grafana Agent

roles/grafana_agent/tasks/install.yml

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+---
+- name: Gather variables for each operating system
+  ansible.builtin.include_vars: "{{ distrovars }}"
+  vars:
+    distrovars: "{{ lookup('first_found', params, errors='ignore') }}"
+    params:
+      skip: true
+      files:
+        - "{{ ansible_distribution | lower }}-{{ ansible_distribution_version | lower }}.yml"
+        - "{{ ansible_distribution | lower }}-{{ ansible_distribution_major_version | lower }}.yml"
+        - "{{ ansible_os_family | lower }}-{{ ansible_distribution_major_version | lower }}.yml"
+        - "{{ ansible_distribution | lower }}.yml"
+        - "{{ ansible_os_family | lower }}.yml"
+      paths:
+        - "vars/"
+  tags:
+    - grafana_agent_install
+    - grafana_agent_configure
+
+- name: Install dependencies
+  ansible.builtin.package:
+    name: "{{ grafana_agent_dependencies }}"
+    state: present
+
+- name: Prepare apt
+  when:
+    - "ansible_pkg_mgr == 'apt'"
+    - grafana_agent_manage_repo
+  block:
+    - name: Import Grafana apt gpg key
+      ansible.builtin.get_url:
+        url: "{{ grafana_agent_apt_key }}"
+        dest: /usr/share/keyrings/grafana.key
+        mode: "0644"
+
+    - name: Add Grafana apt repository
+      ansible.builtin.apt_repository:
+        repo: "{{ grafana_agent_apt_repo }}"
+        state: present
+        update_cache: true
+
+- name: Add Grafana yum/dnf repository
+  when:
+    - "ansible_pkg_mgr in ['yum', 'dnf']"
+    - grafana_agent_manage_repo
+  ansible.builtin.yum_repository:
+    name: grafana
+    description: grafana
+    baseurl: "{{ grafana_agent_yum_repo }}"
+    enabled: true
+    gpgkey: "{{ grafana_agent_yum_key | default(omit) }}"
+    sslverify: true
+    repo_gpgcheck: "{{ true if (grafana_agent_yum_key) else omit }}"
+    gpgcheck: "{{ true if (grafana_agent_yum_key) else omit }}"
+
+- name: "Install Grafana Agent"
+  ansible.builtin.package:
+    name: "{{ grafana_agent_package }}"
+    state: "{{ (grafana_agent_version == 'latest') | ternary('latest', 'present') }}"
+  notify: Restart Grafana Agent