ElasticsearchNodeDiskWatermarkReached warning
Disk Low Watermark Reached at {{ $labels.node }} node in {{ $labels.cluster }} cluster. Shards can not be allocated to this node anymore. You should consider adding more disk to the node.
>>>
> 85
The rule fires when the metric elasticsearch_node_disk_watermark_reached for any node exceeds 85 % of its total disk capacity, meaning the node has passed the low‑disk watermark and Elasticsearch will stop allocating new shards to it. In that case the alert ElasticsearchNodeDiskWatermarkReached is triggered, indicating you should add more disk space to the affected node.
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