Merge branch 'am-email' into 'master'

prometheus: alertmanager email flag

See merge request !58

roles/prometheus/defaults/main.yml

 ---
 
 # Destination (To:) of alert emails.
-alert_email: "root@{{ domain }}"
+alert_email: ""
 
 # Alertmanager SMTP parameters.
 alertmanager_smtp_from: "prometheus@{{ domain }}"

roles/prometheus/templates/alertmanager.yml.j2

@@ -57,6 +57,8 @@ inhibit_rules:
 receivers:
   - name: default
   - name: 'alert-email'
+{% if alert_email %}
     email_configs:
       - to: '{{ alert_email }}'
+{% endif %}