Monitor the number of shards opened in a cluster and raise an alert if it reaches a defined threshold compared to the max allowed :
Current cout:
curl -s http://192.168.100.61:9200/_stats\?pretty | jq '._shards'
{
"total": 2934,
"successful": 2934,
"failed": 0
}Max rules:
[1000|cluster.max_shards_per_nodes setting] * number of nodes