Chris M. Hostetter created SOLR-18616:
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Summary: Solr 10.+ no longer provides any jetty metrics
Key: SOLR-18616
URL: https://issues.apache.org/jira/browse/SOLR-18616
Project: Solr
Issue Type: Sub-task
Reporter: Chris M. Hostetter
[https://lists.apache.org/thread.html/8yzggfvrohv09pqs2wgq1y1nfsq80xhc]
Prior to Solr 10, Solr leveraged 2 "dropwizard" provided jetty plugins in order
to report some key jetty metrics...
* InstrumentedEE10Handler
* InstrumentedQueuedThreadPool
Those were removed by SOLR-17855, w/o any replacement:
[https://github.com/apache/solr/commit/cee53df8e0a]
The major impacts of this loss are:
# no other (existing) solr metrics provide visibility into the number of HTTP
requests, and their associated responses that do *NOT* a valid Solr
collection/core
** so for example: there is no indication in the existing 10.x metrics of a
huge spike of abnormal {{PUT}} requests to a patch that doesn't exist.
# no other (existing) solr metrics provide visibility into the thread
utilization of the jetty (request) thread pool
** so for example: there is no indication in the existing 10.x metrics that
the current number of currently executing requests is growing continuously and
getting close to saturating the max number of threads
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