How to collect Elasticsearch metrics
Summary
The article details how to troubleshoot and resolve "unassigned shards" in Elasticsearch, which occur when shards can't be allocated to nodes. These unassigned shards can indicate cluster issues like node failures, insufficient resources, or misconfigured shard allocation settings. The solution involves investigating the root cause (using cluster health APIs), adjusting allocation filters/awareness, and potentially adding more nodes or resources to the cluster.
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This article originally appeared on Datadog | The Monitor blog.
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