Hi fellow Solr users, I'm looking into improving our Solr monitoring <https://sematext.com/docs/integration/solr/> and I was curious on which metrics you consider relevant.
>From what we currently have, I'm only really missing fieldCache. Which we collect, but not show in the UI yet (unless you add a custom chart - we'll add it to default soon). You can click on a demo account <https://apps.sematext.com/demo> (there's a Solr app there called PH.Prod.Solr7) to see what we already collect, but I'll write it here in short: - query rate and latency (you can group per handler, per core, per collection if it's SolrCloud) - index size (number of segments, files...) - indexing: added/deleted docs, commits - caches (size, hit ratio, warmup...) - OS- and JVM-level metrics (from CPU iowait to GC latency and everything in between) Anything that we should add? I went through the Metrics API output, and the only significant thing I can think of is the transaction log. But to be honest I never checked those metrics in practice. Or maybe there's something outside the Metrics API that would be useful? I thought about the breakdown of shards that are up/down/recovering... as well as replica types. We plan on adding those, but there's a challenge in de-duplicating metrics. Because one would install one agent per node, and I'm not aware of a way to show only local shards in the Collections API -> CLUSTERSTATUS. Thanks in advance for any feedback that you may have! Radu -- Monitoring - Log Management - Alerting - Anomaly Detection Solr & Elasticsearch Consulting Support Training - http://sematext.com/
