Adding alert rules file template

dicos/70_prometheus.xml

@@ -1,9 +1,10 @@
 <?xml version="1.0" encoding="utf-8"?>
 <creole>
     <files>
-        <file filelist='prometheus'   name='/etc/prometheus/prometheus.yml'   mkdir='True' rm='True'/>
-        <file filelist='alertmanager' name='/etc/prometheus/alertmanager.yml' mkdir='True' rm='True'/>
-        <file filelist='grafana'      name='/etc/grafana/grafana.ini'         mkdir='True' rm='True'/>
+        <file filelist='prometheus'   name='/etc/prometheus/prometheus.yml'          mkdir='True' rm='True'/>
+        <file filelist='alertmanager' name='/etc/prometheus/alertmanager.yml'        mkdir='True' rm='True'/>
+		<file filelist='alertmanager' name='/etc/prometheus/rules.d/alert-rules.yml' mkdir='True' rm='True'/>
+        <file filelist='grafana'      name='/etc/grafana/grafana.ini'                mkdir='True' rm='True'/>
 
         <service>prometheus</service>
         <service>alertmanager</service>

tmpl/alert-rules.yml

@@ -0,0 +1,41 @@
+#
+# Alert Rules
+#
+groups:
+- name: EoleRules
+  rules:
+  # Instance is Down
+  - alert: JobInstanceDown
+    expr: up == 0
+    for: 1m
+    annotations:
+      DESCRIPTION: Job {{ $labels.job }} instance {{ $labels.instance }} is down.
+      SUMMARY: Job instance is down
+
+  # Heavy CPU usage
+  - alert: cpu_threshold_exceeded
+    expr: (100 * (1 - avg by(instance) (irate(node_cpu{job="%%{job_name_node}",mode="idle"}[5m]))))
+      > 80
+    annotations:
+      description: This device's cpu usage has exceeded the threshold with a value
+        of {{ $value }}.
+      summary: Instance {{ $labels.instance }} CPU usage is dangerously high
+
+  # Heavy Memory usage
+  - alert: mem_threshold_exceeded
+    expr: (node_memory_MemFree{job="%%{job_name_node}"} + node_memory_Cached{job="%%{job_name_node}"} + node_memory_Buffers{job="%%{job_name_node}"})
+      / 1e+06 < 80
+    annotations:
+      description: This device's memory usage has exceeded the threshold with a value
+        of {{ $value }}.
+      summary: Instance {{ $labels.instance }} memory usage is dangerously high
+
+  # Heavy "/" use
+  - alert: filesystem_threshold_exceeded
+    expr: node_filesystem_avail{job="%%{job_name_node}",mountpoint="/"} / node_filesystem_size{job="%%{job_name_node}"}
+      * 100 < 90
+    annotations:
+      description: This device's filesystem usage has exceeded the threshold with
+        a value of {{ $value }}.
+      summary: Instance {{ $labels.instance }} filesystem usage is dangerously high
+

tmpl/prometheus.yml

@@ -5,7 +5,7 @@ global:
   scrape_timeout: %%prometheusScrapeTimeout
 
 rule_files:
-- "/etc/prometheus/rules.d/*.yml"
+  - "/etc/prometheus/rules.d/*.yml"
 
 scrape_configs:
   - job_name: %%prometheusJobName