From aa7216d6e24b0cb389b7dafa871ab06015c977ea Mon Sep 17 00:00:00 2001
From: uumas <gitcommit@uumas.fi>
Date: Tue, 21 Mar 2023 01:33:57 +0200
Subject: [PATCH] Add Prometheus role

---
 roles/prometheus/defaults/main.yml           |  6 ++
 roles/prometheus/meta/argument_specs.yml     | 73 ++++++++++++++++++++
 roles/prometheus/tasks/main.yml              | 22 ++++++
 roles/prometheus/templates/prometheus.yml.j2 | 34 +++++++++
 4 files changed, 135 insertions(+)
 create mode 100644 roles/prometheus/defaults/main.yml
 create mode 100644 roles/prometheus/meta/argument_specs.yml
 create mode 100644 roles/prometheus/tasks/main.yml
 create mode 100644 roles/prometheus/templates/prometheus.yml.j2

diff --git a/roles/prometheus/defaults/main.yml b/roles/prometheus/defaults/main.yml
new file mode 100644
index 0000000..58f3607
--- /dev/null
+++ b/roles/prometheus/defaults/main.yml
@@ -0,0 +1,6 @@
+---
+
+prometheus_scrape_interval: 5s
+prometheus_evaluation_interval: 15s
+prometheus_install_grafana: false
+prometheus_hcloud_relabel_configs: []
diff --git a/roles/prometheus/meta/argument_specs.yml b/roles/prometheus/meta/argument_specs.yml
new file mode 100644
index 0000000..32ec5d9
--- /dev/null
+++ b/roles/prometheus/meta/argument_specs.yml
@@ -0,0 +1,73 @@
+---
+
+argument_specs:
+  main:
+    short_description: Prometheus docker container
+    options:
+      prometheus_scrape_interval:
+        description: Interval how often prometheus will scrape the monitoring targets
+        type: str
+        required: false
+        default: 5s
+      prometheus_evaluation_interval:
+        description: Interval how often prometheus will evaluate the scraped metrics against defined conditions
+        type: str
+        required: false
+        default: 15s
+      prometheus_hcloud_token:
+        description: Access token for hetzner cloud service discovery. It will be enabled if this variable is defined
+        type: str
+        required: false
+      prometheus_hcloud_relabel_configs:
+        description: Relabel configs for hcloud
+        type: list
+        required: false
+        default: []
+        elements: dict
+        options:
+          source_labels:
+            type: list
+            required: true
+            elements: str
+          target_label:
+            type: str
+            required: true
+          replacement:
+            type: str
+            required: false
+      prometheus_install_grafana:
+        description: If true, installs grafana in the same docker network as prometheus and configures it with prometheus as data source
+        type: bool
+        required: false
+        default: false
+
+      # All options after this will be passed directly to the container role
+      docker_service_suffix:
+        description: "Passed to container role"
+        required: false
+      docker_host_user:
+        description: "Passed to container role"
+        required: false
+
+      database_passwords:
+        description: "Passed to container role"
+        required: false
+      docker_additional_services:
+        description: "Passed to container role"
+        required: false
+
+      docker_volume_type:
+        description: "Passed to container role"
+        required: false
+      reverse_proxy_type:
+        description: "Passed to container role"
+        required: false
+      ports:
+        description: "Passed to container role"
+        required: false
+      docker_vhost_domains:
+        description: "Passed to container role"
+        required: false
+      docker_entrypoint:
+        description: "Passed to container role"
+        required: false
diff --git a/roles/prometheus/tasks/main.yml b/roles/prometheus/tasks/main.yml
new file mode 100644
index 0000000..54a2bef
--- /dev/null
+++ b/roles/prometheus/tasks/main.yml
@@ -0,0 +1,22 @@
+---
+
+- name: Prometheus container
+  import_role:
+    name: container
+  vars:
+    docker_service: prometheus
+    docker_image: prom/prometheus
+    reverse_proxy_type: none
+    docker_volumes:
+      - name: data
+        path: /prometheus
+      - template: prometheus.yml
+        path: /etc/prometheus/prometheus.yml
+      
+- name: Grafana container for prometheus
+  include_role: 
+    name: grafana
+  vars:
+    docker_networks: 
+      - name: prometheus
+  when: prometheus_install_grafana
diff --git a/roles/prometheus/templates/prometheus.yml.j2 b/roles/prometheus/templates/prometheus.yml.j2
new file mode 100644
index 0000000..67f64dd
--- /dev/null
+++ b/roles/prometheus/templates/prometheus.yml.j2
@@ -0,0 +1,34 @@
+---
+
+# my global config
+global:
+  scrape_interval: {{ prometheus_scrape_interval }}
+  evaluation_interval: {{ prometheus_evaluation_interval }}
+
+# Alertmanager configuration
+alerting:
+  alertmanagers:
+    - static_configs:
+        - targets:
+          # - alertmanager:9093
+
+# Load rules once and periodically evaluate them according to the global 'evaluation_interval'.
+rule_files:
+  # - "first_rules.yml"
+  # - "second_rules.yml"
+
+# A scrape configuration containing exactly one endpoint to scrape:
+# Here it's Prometheus itself.
+scrape_configs:
+  - job_name: "prometheus"
+    static_configs:
+      - targets: ["localhost:9090"]
+
+{% if prometheus_hcloud_token is defined %}
+  - job_name: hcloud
+    hetzner_sd_configs:
+      - role: hcloud
+        authorization:
+          credentials: {{ prometheus_hcloud_token }}
+    relabel_configs: {{ prometheus_hcloud_relabel_configs }}
+{% endif %}