r/vmalert: Deploy vmalert

`vmalert` is a component of Victoria Metrics. It handles alerting and
recording rules, periodically executing queries and dispatching alerts
or writing aggregated data back to the TSDB.

roles/vmalert/defaults/main.yml

@@ -0,0 +1,2 @@
+vmalert_rules:
+  groups: []

roles/vmalert/handlers/main.yml

@@ -0,0 +1,9 @@
+- name: restart vmalert
+  service:
+    name: vmalert
+    state: restarted
+
+- name: reload vmalert
+  uri:
+    url: http://[::1]:8880/-/reload
+  changed_when: true

roles/vmalert/tasks/deploy.yml

@@ -0,0 +1,59 @@
+- name: ensure victoria metrics config directory exists
+  file:
+    path: /etc/victoria-metrics
+    mode: u=rwx,go=rx
+    owner: root
+    group: root
+    state: directory
+  tags:
+  - config
+- name: ensure vmalert rules directory exists
+  file:
+    path: /etc/victoria-metrics/rules
+    mode: u=rwx,go=rx
+    owner: root
+    group: root
+    state: directory
+  tags:
+  - config
+
+- name: ensure vmalert alert rules are configured
+  copy:
+    dest: /etc/victoria-metrics/rules/alerts.yml
+    content: |+
+      {{ vmalert_rules | to_nice_yaml(indent=2) }}
+    mode: u=rw,go=r
+    owner: root
+    group: root
+  notify:
+  - reload vmalert
+  tags:
+  - config
+  - alerts-config
+
+- name: ensure vmalert environment variables are set
+  template:
+    src: vmalert.sysconfig.j2
+    dest: /etc/sysconfig/vmalert
+    mode: u=rw,go=r
+    owner: root
+    group: root
+  notify:
+  - restart vmalert
+  tags:
+  - config
+
+- name: ensure vmalert starts at boot
+  service:
+    name: vmalert
+    enabled: true
+  tags:
+  - service
+- name: flush handlers
+  meta: flush_handlers
+- name: ensure vmalert is running
+  service:
+    name: vmalert
+    state: started
+  tags:
+  - service

roles/vmalert/tasks/main.yml

@@ -0,0 +1,7 @@
+- block:
+#  - import_tasks: install.yml
+#    tags:
+#    - install
+  - import_tasks: deploy.yml
+  tags:
+  - vmalert

roles/vmalert/templates/vmalert.sysconfig.j2

@@ -0,0 +1,12 @@
+{% if vmalert_datasource_url|d %}
+datasource_url={{ vmalert_datasource_url }}
+{% endif %}
+{% if vmalert_notifier_url|d %}
+notifier_url={{ vmalert_notifier_url }}
+{% endif %}
+{% if vmalert_remote_read_url|d %}
+remoteRead_url={{ vmalert_remote_read_url }}
+{% endif %}
+{% if vmalert_remote_write_url|d %}
+remoteWrite_url={{ vmalert_remote_write_url }}
+{% endif %}

victoria-metrics.yml

@@ -6,3 +6,7 @@
 - hosts: vmagent
   roles:
   - vmagent
+
+- hosts: vmalert
+  roles:
+  - vmalert