Create elasticsearch.rules.yml

same as elasticsearch.rules, but in the prometheus 2 format.

Author: caarlos0

examples/prometheus/elasticsearch.rules.yml

@@ -0,0 +1,25 @@
+groups:
+- name: elasticsearch
+  rules:
+  - record: elasticsearch_filesystem_data_used_percent
+    expr: 100 * (elasticsearch_filesystem_data_size_bytes - elasticsearch_filesystem_data_free_bytes)
+      / elasticsearch_filesystem_data_size_bytes
+  - record: elasticsearch_filesystem_data_free_percent
+    expr: 100 - elasticsearch_filesystem_data_used_percent
+  - alert: ElasticsearchTooFewNodesRunning
+    expr: elasticsearch_cluster_health_number_of_nodes < 3
+    for: 5m
+    labels:
+      severity: critical
+    annotations:
+      description: There are only {{$value}} < 3 ElasticSearch nodes running
+      summary: ElasticSearch running on less than 3 nodes
+  - alert: ElasticsearchHeapTooHigh
+    expr: elasticsearch_jvm_memory_used_bytes{area="heap"} / elasticsearch_jvm_memory_max_bytes{area="heap"}
+      > 0.9
+    for: 15m
+    labels:
+      severity: critical
+    annotations:
+      description: The heap usage is over 90% for 15m
+      summary: ElasticSearch node {{$labels.node}} heap usage is high