add alertmanager role

roles/alertmanager/README.md

@@ -0,0 +1,53 @@
+genlab.alertmanager
+=========
+
+The [Alertmanager](https://github.com/prometheus/alertmanager) handles alerts sent by client applications such as the Prometheus server. It takes care of deduplicating, grouping, and routing them to the correct receiver integration such as email, PagerDuty, or OpsGenie. It also takes care of silencing and inhibition of alerts.
+
+You'll need to manually specify the paths to your template files in the main Alertmanager configuration file (`alertmanager.yml`) on the target machine. The configuration file must have a `.yml` suffix, and template files must use a `.tmpl` suffix.
+
+Requirements
+------------
+
+None
+
+Role Variables
+--------------
+
+```
+alertmanager_version: 0.28.1          # version of Alertmanager (AM)
+config_dir: "/etc/alertmanager/conf"  # where to place AM configs
+storage_dir: "/var/lib/alertmanager"  # path to AM storage
+alertmanager_dir: "/etc/alertmanager" # where to install AM on target
+alertmanager_user: "alertmanager"     # system user name
+alertmanager_group: "alertmanager"    # system group name
+config_source_dir: "./alertmanager"   # path to config files on source
+
+# Optional
+template_source_dir: "./templates"    # path to template files on source
+```
+
+Dependencies
+------------
+
+None
+
+Example Playbook
+----------------
+
+```yaml
+roles:
+    - role: genlab.template
+      config_source_dir: alertmanager
+      alertmanager_version: 0.28.1
+
+```
+
+License
+-------
+
+BSD
+
+Author Information
+------------------
+
+corvus-migratorius@proton.me