Add cadvisor support with monitoring stack: alertmanager, loki, node-red, promtail

roles/alertmanager/templates/alertmanager.yml.j2

@@ -0,0 +1,21 @@
+global:
+  smtp_smarthost: 'localhost:25'
+  smtp_from: 'alertmanager@example.com'
+
+route:
+  group_by: ['alertname']
+  group_wait: 30s
+  group_interval: 5m
+  repeat_interval: 12h
+  receiver: 'email-notifications'
+
+receivers:
+- name: 'email-notifications'
+  email_configs:
+  - to: 'alerts@example.com'
+    send_resolved: true
+
+- name: 'webhook-notifications'
+  webhook_configs:
+  - url: 'http://node-red:1880/alerts'
+    send_resolved: true