added default alerts for nodes

templates/node-alerts.j2

@@ -0,0 +1,10 @@
+groups:
+{% for groupname, alerts in prometheus_agent.alerts|dict2items|groupby("value.group") %}
+- name: "{{inventory_hostname}}: {{ groupname }}"
+  rules:
+{% for alertdict in alerts if alertdict.value.enabled %}
+  - alert: {{ alertdict.value.alert|d(alertdict.key) }}
+{% set alert=alertdict.value|dict2items|rejectattr('key', 'in', ["enabled", "group", "alert"])|list|items2dict %}
+{{ alert|to_nice_yaml(indent=2, width=9999)|indent(width=4, first=True) }}
+{% endfor %}
+{% endfor %}