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https://issues.apache.org/jira/browse/SOLR-8207?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16465265#comment-16465265
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Andrzej Bialecki commented on SOLR-8207:
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bq. That were the only numbers I found in current metrics API. I agree that if
it is possible to get, say, last-15-minutes numbers that would be much better.
This is the information that we get directly from {{GarbageCollectorMXBean}}
and it consists of a counter (how many times the particular GC algo has run
since JVM was started) and the cumulative "elapsed time" for the algo. I'm not
sure how the "last 5 min stats" was calculated here in the patch. No other
information is currently collected by the metrics API - these are just
momentary readings (gauges) from the MXBeans that are presented via metrics API.
Having said that, it's pretty simple to create a {{Meter}} or a {{Timer}} for
each of these GC beans and register them as new metrics - then we will get 1-,
5- and 15-min averages for each GC, as well as a histogram of timings (which
can be approximated from deltas in cumulative time).
> Modernise cloud tab on Admin UI
> -------------------------------
>
> Key: SOLR-8207
> URL: https://issues.apache.org/jira/browse/SOLR-8207
> Project: Solr
> Issue Type: Improvement
> Components: Admin UI
> Affects Versions: 5.3
> Reporter: Upayavira
> Assignee: Jan Høydahl
> Priority: Major
> Attachments: node-compact.png, node-details.png, node-hostcolumn.png,
> node-toggle-row-numdocs.png, nodes-tab-real.png, nodes-tab.png
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> The various sub-tabs of the "Cloud tab" were designed before anyone was
> making real use of SolrCloud, and when we didn't really know the use-cases we
> would need to support. I would argue that, whilst they are pretty (and
> clever) they aren't really fit for purpose (with the exception of tree view).
> Issues:
> * Radial view doesn't scale beyond a small number of nodes/collections
> * Paging on the graph view is based on collections - so a collection with
> many replicas won't be subject to pagination
> * The Dump feature is kinda redundant and should be removed
> * There is now a major overlap in functionality with the new Collections tab
> What I'd propose is that we:
> * promote the tree tab to top level
> * remove the graph views and the dump tab
> * add a new Nodes tab
> This nodes tab would complement the collections tab - showing nodes, and
> their associated replicas/collections. From this view, it would be possible
> to add/remove replicas and to see the status of nodes. It would also be
> possible to filter nodes by status: "show me only up nodes", "show me nodes
> that are in trouble", "show me nodes that have leaders on them", etc.
> Presumably, if we have APIs to support it, we might have a "decommission
> node" option, that would ensure that no replicas on this node are leaders,
> and then remove all replicas from the node, ready for it to be removed from
> the cluster.
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