MetricsCollectorHandler deprecated warning (missing documentation)

after upgrading from 8.8.2 to 8.9.0 i got the following warning:
MetricsCollectorHandler
Solr loaded a deprecated plugin/analysis class [org.apache.solr.handler.admin.MetricsCollectorHandler]. Please consult documentation how to replace it accordingly.

i found the corresponding change:
https://solr.apache.org/docs/8_9_0/changes/Changes.html#v8.9.0.other_changes
SOLR-15416

but not how to solve it (documenaton mentioned above in the warning is missing).

I also think link to the documentation in the release notes has changed/is broken:
https://github.com/apache/lucene-solr/blob/master/solr/solr-ref-guide/src/solr-upgrade-notes.adoc
=>
https://gitbox.apache.org/repos/asf?p=solr.git;a=blob;f=solr/solr-ref-guide/src/solr-upgrade-notes.adoc

but cannot find how to solve that warning here also.
I grep my configs but can't find anything related.