Shalin Shekhar Mangar created SOLR-6325:
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             Summary: Expose per-collection and per-shard aggregate statistics
                 Key: SOLR-6325
                 URL: https://issues.apache.org/jira/browse/SOLR-6325
             Project: Solr
          Issue Type: Sub-task
          Components: SolrCloud
            Reporter: Shalin Shekhar Mangar
            Assignee: Shalin Shekhar Mangar


SolrCloud doesn't provide any aggregate stats about the cluster or a 
collection. Very common questions such as document counts per shard, index 
sizes, request rates etc cannot be answered easily without figuring out the 
cluster state, invoking multiple core admin APIs and aggregating them manually.

I propose that we expose an API which returns each of the following on a 
per-collection and per-shard basis:
# Document counts
# Index size on disk
# Query request rate
# Indexing request rate
# Real time get request rate

I am not yet sure if this should be a distributed search component or a 
collection API.



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