Page History

...

http://localhost:8080/solr/search/select?q=search.resourcetype:2&sort=dc.date.accessioned_dt%20desc

Note:

To get only the first (newest) item (rows=1) with all but the date accessioned field filtered out (fl=dc.date.accessioned) and without the Solr response header (omitHeader=true):

...

http://localhost:8080/solr/statistics/select?indent=on&version=2.2&start=0&rows=10&fl=*%2Cscore&qt=standard&wt=standard&explainOther=&hl.fl=&facet=true&facet.field=epersonid&q=type:0

Note:

Number of items in a specific community

...

http://localhost:8080/solr/search/select/search/select/?q=location.comm:85+AND+search.resourcetype:2&version=2.2&start=0&rows=0&indent=on?q=location.comm:85+AND+search.resourcetype:2&start=0&rows=0&indent=on

Statistics breakdown per event type

Starting from DSpace 3, there is a statistics_type field in the statistics core that contains the "usage event type". Currently, the available types are search, view, search_result and workflow. Here's how to get event breakdown by type, excluding robots (isBot:false):

http://localhost:8080/solr/statistics/select?indent=on&rows=0&facet=true&facet.field=statistics_type&q=isBot:false

Statistics: breakdown of downloads per month

Show breakdown of bitstream (type:0) downloads per month in the year 2016, excluding robots (isBot:false):

http://localhost:8080/solr/statistics/select?indent=on&rows=0&facet=true&facet.date=time&facet.date.start=2016-01-01T00:00:00Z&facet.date.end=2017-01-01T00:00:00Z&facet.date.gap=%2B1MONTH&q=type:0+AND+isBot:false

Querying Solr from XMLUI

Since Solr returns its responses in XML, it's possible and easy to call custom Solr queries from XMLUI, process the XML response with XSLT and display the results in human-readable form on the HTML page.
There are two ways how to do that - synchronously in Cocoon or asynchronously using AJAX (JavaScript) after the page is loaded. Solr queries are usually very fast, so only synchronous calls will be shown here.

...

It should also be possible to use it in other versions of DSpace (starting from 1.6), but these use different versions of Solr, so modify the procedure accordingly (and expect other caveats):

Note: In older versions, you may need to specify the queryResponseWriter class as org.apache.solr.request.VelocityResponseWriter (I haven't tested it, though)

...