feat: include influxdb exporter role

Include the [Influxdb exporter](https://github.com/prometheus/influxdb_exporter) role.

roles/influxdb_exporter/README.md

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+# Ansible Role: influxdb exporter
+
+## Description
+
+Deploy prometheus [influxdb exporter](https://github.com/prometheus/influxdb_exporter) using ansible.
+
+## Requirements
+
+- Ansible >= 2.9 (It might work on previous versions, but we cannot guarantee it)
+- gnu-tar on Mac deployer host (`brew install gnu-tar`)
+
+## Role Variables
+
+All variables which can be overridden are stored in [defaults/main.yml](defaults/main.yml) file as well as in [meta/argument_specs.yml](meta/argument_specs.yml).
+Please refer to the [collection docs](https://prometheus-community.github.io/ansible/branch/main/influxdb_exporter_role.html) for description and default values of the variables.
+
+## Example
+
+### Playbook
+
+Use it in a playbook as follows:
+
+```yaml
+- hosts: all
+  roles:
+    - prometheus.prometheus.influxdb_exporter
+```
+
+### Demo site
+
+We provide an example site that demonstrates a full monitoring solution based on prometheus and grafana.
+The repository with code and links to running instances is [available on github](https://github.com/prometheus/demo-site) and the site is hosted on [DigitalOcean](https://digitalocean.com).
+
+## Local Testing
+
+The preferred way of locally testing the role is to use Docker and [molecule](https://github.com/ansible-community/molecule) (v3.x).
+You will have to install Docker on your system. See "Get started" for a Docker package suitable for your system. Running your tests is as simple as executing `molecule test`.
+
+## Continuous Integration
+
+Combining molecule and circle CI allows us to test how new PRs will behave when used with multiple ansible versions and multiple operating systems.
+This also allows use to create test scenarios for different role configurations. As a result we have quite a large test matrix which can take more time than local testing, so please be patient.
+
+## Contributing
+
+See [contributor guideline](CONTRIBUTING.md).
+
+## Troubleshooting
+
+See [troubleshooting](TROUBLESHOOTING.md).
+
+## License
+
+This project is licensed under MIT License. See [LICENSE](/LICENSE) for more details.

roles/influxdb_exporter/defaults/main.yml

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+---
+influxdb_exporter_version: "0.11.5"
+influxdb_exporter_binary_local_dir: ""
+influxdb_exporter_binary_url: "https://github.com/{{ _influxdb_exporter_repo }}/releases/download/v{{ influxdb_exporter_version }}/\
+                           influxdb_exporter-{{ influxdb_exporter_version }}.linux-{{ go_arch }}.tar.gz"
+influxdb_exporter_checksums_url: "https://github.com/{{ _influxdb_exporter_repo }}/releases/download/v{{ influxdb_exporter_version }}/sha256sums.txt"
+influxdb_exporter_skip_install: false
+
+influxdb_exporter_web_listen_address: "0.0.0.0:9122"
+influxdb_exporter_udp_bind_address: "{{ influxdb_exporter_web_listen_address }}"
+influxdb_exporter_web_telemetry_path: "/metrics"
+influxdb_exporter_exporter_web_telemetry_path: "/metrics/exporter"
+influxdb_exporter_influxdb_sample_expiry: "5m"
+influxdb_exporter_log_level: "info"
+influxdb_exporter_log_format: "logfmt"
+influxdb_exporter_export_timestamps: true
+
+influxdb_exporter_binary_install_dir: "/usr/local/bin"
+influxdb_exporter_system_group: "influxdb-exp"
+influxdb_exporter_system_user: "{{ influxdb_exporter_system_group }}"
+
+# Local path to stash the archive and its extraction
+influxdb_exporter_archive_path: /tmp

roles/influxdb_exporter/handlers/main.yml

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+---
+- name: Restart influxdb_exporter
+  listen: "restart influxdb_exporter"
+  become: true
+  ansible.builtin.systemd:
+    daemon_reload: true
+    name: influxdb_exporter
+    state: restarted
+  when:
+    - not ansible_check_mode

roles/influxdb_exporter/meta/argument_specs.yml

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+---
+# yamllint disable rule:line-length
+argument_specs:
+  main:
+    short_description: "Prometheus Influxdb Exporter"
+    description:
+      - "Deploy prometheus L(influxdb exporter,https://github.com/prometheus/influxdb_exporter) using ansible"
+    author:
+      - "Prometheus Community"
+    options:
+      influxdb_exporter_version:
+        description: "influxdb exporter package version. Also accepts latest as parameter."
+        default: "0.11.5"
+      influxdb_exporter_skip_install:
+        description: "influxdb exporter installation tasks gets skipped when set to true."
+        type: bool
+        default: false
+      influxdb_exporter_binary_local_dir:
+        description:
+          - "Enables the use of local packages instead of those distributed on github."
+          - "The parameter may be set to a directory where the C(influxdb_exporter) binary is stored on the host where ansible is run."
+          - "This overrides the I(influxdb_exporter_version) parameter"
+      influxdb_exporter_binary_url:
+        description: "URL of the influxdb exporter binaries .tar.gz file"
+        default: "https://github.com/{{ _influxdb_exporter_repo }}/releases/download/v{{ influxdb_exporter_version }}/influxdb_exporter-{{ influxdb_exporter_version }}.linux-{{ go_arch }}.tar.gz"
+      influxdb_exporter_checksums_url:
+        description: "URL of the influxdb exporter checksums file"
+        default: "https://github.com/{{ _influxdb_exporter_repo }}/releases/download/v{{ influxdb_exporter_version }}/sha256sums.txt"
+      influxdb_exporter_web_listen_address:
+        description: "Address on which influxdb exporter will listen"
+        default: "0.0.0.0:9122"
+      influxdb_exporter_web_telemetry_path:
+        description: "Path under which to expose metrics"
+        default: "/metrics"
+      influxdb_exporter_influxdb_sample_expiry:
+        description: "How long a sample is valid for"
+        default: "5m"
+      influxdb_exporter_udp_bind_address:
+        description: "Address on which to listen for udp packets"
+        default: "0.0.0.0:9122"
+      influxdb_exporter_exporter_web_telemetry_path:
+        description: "Path under which to expose metrics"
+        default: "/metrics"
+      influxdb_exporter_log_level:
+        default: "info"
+        description: "Only log messages with the given severity or above"
+        choices: ["debug", "info", "warn", "error"]
+      influxdb_exporter_log_format:
+        default: "logfmt"
+        description: "Output format of log messages"
+        choices: ["logfmt", "json"]
+      influxdb_exporter_export_timestamps:
+        default: true
+        description: "Export timestamps of points"
+      influxdb_exporter_binary_install_dir:
+        description:
+          - "I(Advanced)"
+          - "Directory to install influxdb_exporter binary"
+        default: "/usr/local/bin"
+      influxdb_exporter_system_group:
+        description:
+          - "I(Advanced)"
+          - "System group for influxdb exporter"
+        default: "influxdb-exp"
+      influxdb_exporter_system_user:
+        description:
+          - "I(Advanced)"
+          - "influxdb exporter user"
+        default: "influxdb-exp"
+      influxdb_exporter_archive_path:
+        description: 'Local path to stash the archive and its extraction'
+        default: "/tmp"

roles/influxdb_exporter/meta/main.yml

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+---
+galaxy_info:
+  author: "Prometheus Community"
+  description: "Prometheus Influxdb Exporter"
+  license: "Apache"
+  min_ansible_version: "2.9"
+  platforms:
+    - name: "Ubuntu"
+      versions:
+        - "focal"
+        - "jammy"
+    - name: "Debian"
+      versions:
+        - "bullseye"
+        - "buster"
+    - name: "EL"
+      versions:
+        - "8"
+        - "9"
+  galaxy_tags:
+    - "monitoring"
+    - "prometheus"
+    - "exporter"
+    - "metrics"
+    - "system"

roles/influxdb_exporter/molecule/alternative/molecule.yml

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+---
+provisioner:
+  inventory:
+    group_vars:
+      all:
+        influxdb_exporter_binary_local_dir: "/tmp/influxdb_exporter-linux-amd64"
+        influxdb_exporter_web_listen_address:
+          - '127.0.0.1:8080'
+          - '127.0.1.1:8080'
+
+        go_arch: amd64
+        influxdb_exporter_version: 0.11.2

roles/influxdb_exporter/molecule/alternative/prepare.yml

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+---
+- name: Run local preparation
+  hosts: localhost
+  gather_facts: false
+  tasks:
+    - name: Download influxdb_exporter binary to local folder
+      become: false
+      ansible.builtin.get_url:
+        url: "https://github.com/prometheus/influxdb_exporter/releases/download/v{{\
+          \ influxdb_exporter_version }}/influxdb_exporter-{{ influxdb_exporter_version }}.linux-{{\
+          \ go_arch }}.tar.gz"
+        dest: "/tmp/influxdb_exporter-{{ influxdb_exporter_version }}.linux-{{ go_arch }}.tar.gz"
+        mode: 0644
+      register: _download_binary
+      until: _download_binary is succeeded
+      retries: 5
+      delay: 2
+      check_mode: false
+
+    - name: Unpack influxdb_exporter binary
+      become: false
+      ansible.builtin.unarchive:
+        src: "/tmp/influxdb_exporter-{{ influxdb_exporter_version }}.linux-{{ go_arch }}.tar.gz"
+        dest: "/tmp"
+        creates: "/tmp/influxdb_exporter-{{ influxdb_exporter_version }}.linux-{{ go_arch\
+          \ }}/influxdb_exporter"
+      check_mode: false
+
+    - name: Link to influxdb_exporter binaries directory
+      become: false
+      ansible.builtin.file:
+        src: "/tmp/influxdb_exporter-{{ influxdb_exporter_version }}.linux-amd64"
+        dest: "/tmp/influxdb_exporter-linux-amd64"
+        state: link
+      check_mode: false

roles/influxdb_exporter/molecule/alternative/tests/test_alternative.py

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+from __future__ import (absolute_import, division, print_function)
+__metaclass__ = type
+
+import os
+import testinfra.utils.ansible_runner
+import pytest
+
+testinfra_hosts = testinfra.utils.ansible_runner.AnsibleRunner(
+    os.environ['MOLECULE_INVENTORY_FILE']).get_hosts('all')
+
+
+def test_directories(host):
+    dirs = [
+        "/var/lib/influxdb_exporter"
+    ]
+    for dir in dirs:
+        d = host.file(dir)
+        assert not d.exists
+
+
+def test_service(host):
+    s = host.service("influxdb_exporter")
+    try:
+        assert s.is_running
+    except AssertionError:
+        # Capture service logs
+        journal_output = host.run('journalctl -u influxdb_exporter --since "1 hour ago"')
+        print("\n==== journalctl -u influxdb_exporter Output ====\n")
+        print(journal_output)
+        print("\n============================================\n")
+        raise  # Re-raise the original assertion error
+
+
+@pytest.mark.parametrize("sockets", [
+    "tcp://127.0.0.1:8080",
+    "tcp://127.0.1.1:8080",
+])
+def test_socket(host, sockets):
+    assert host.socket(sockets).is_listening

roles/influxdb_exporter/molecule/default/molecule.yml

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+---
+provisioner:
+  inventory:
+    group_vars:
+      all:
+        influxdb_exporter_web_listen_address: "127.0.0.1:9122"

roles/influxdb_exporter/molecule/default/tests/test_default.py

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+from __future__ import (absolute_import, division, print_function)
+__metaclass__ = type
+
+import os
+import testinfra.utils.ansible_runner
+
+testinfra_hosts = testinfra.utils.ansible_runner.AnsibleRunner(
+    os.environ['MOLECULE_INVENTORY_FILE']).get_hosts('all')
+
+
+def test_directories(host):
+    dirs = [
+        "/var/lib/influxdb_exporter"
+    ]
+    for dir in dirs:
+        d = host.file(dir)
+        assert d.is_directory
+        assert d.exists
+
+
+def test_files(host):
+    files = [
+        "/etc/systemd/system/influxdb_exporter.service",
+        "/usr/local/bin/influxdb_exporter"
+    ]
+    for file in files:
+        f = host.file(file)
+        assert f.exists
+        assert f.is_file
+
+
+def test_permissions_didnt_change(host):
+    dirs = [
+        "/etc",
+        "/root",
+        "/usr",
+        "/var"
+    ]
+    for file in dirs:
+        f = host.file(file)
+        assert f.exists
+        assert f.is_directory
+        assert f.user == "root"
+        assert f.group == "root"
+
+
+def test_user(host):
+    assert host.group("influxdb-exp").exists
+    assert "influxdb-exp" in host.user("influxdb-exp").groups
+    assert host.user("influxdb-exp").shell == "/usr/sbin/nologin"
+    assert host.user("influxdb-exp").home == "/"
+
+
+def test_service(host):
+    s = host.service("influxdb_exporter")
+    try:
+        assert s.is_running
+    except AssertionError:
+        # Capture service logs
+        journal_output = host.run('journalctl -u influxdb_exporter --since "1 hour ago"')
+        print("\n==== journalctl -u influxdb_exporter Output ====\n")
+        print(journal_output)
+        print("\n============================================\n")
+        raise  # Re-raise the original assertion error
+
+
+def test_socket(host):
+    sockets = [
+        "tcp://127.0.0.1:9122"
+    ]
+    for socket in sockets:
+        s = host.socket(socket)
+        assert s.is_listening

roles/influxdb_exporter/molecule/latest/molecule.yml

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+---
+provisioner:
+  inventory:
+    group_vars:
+      all:
+        influxdb_exporter_version: latest