Apache Solr¶

The solr probe monitors Apache Solr via the native metrics API (/solr/admin/metrics?wt=json&group=all) and the core status endpoint (/solr/admin/cores?action=STATUS), reporting JVM heap and threads, node-level request and cache counters, and per-core document count and index size.

Quick start¶

probes:
  - name: solr
    type: solr
    params:
      endpoint: http://localhost:8983

Parameters¶

Parameter	Default	Description
`endpoint`	`http://localhost:8983`	Solr base URL (without trailing slash)

Metrics¶

Metric	Unit	Description
`senhub.solr.up`	1	1 when the Solr admin metrics endpoint responded
`jvm.memory.heap.used`	By	JVM heap memory used by the Solr process
`jvm.memory.heap.max`	By	JVM maximum heap size
`jvm.threads.count`	{thread}	Current live JVM thread count
`solr.request.count`	{request}	Requests processed by the node
`solr.request.errors`	{error}	Request errors on the node
`solr.request.latency.avg`	ms	Average request latency
`solr.cache.lookups`	{lookup}	Cache lookups (filter / query / document cache)
`solr.cache.hits`	{hit}	Cache hits
`solr.core.document.count`	{document}	Number of indexed documents per core, tagged with `core`
`solr.core.index.size`	By	Index size on disk per core

Operational notes¶

No authentication is required by default. If Solr is configured with Basic Auth, the probe does not yet support credentials — use the unauthenticated path or a local loopback address.
For SolrCloud, point the probe at one node; cluster-wide aggregates are not covered in this release.