We noticed a higher than usual amt. of connections on the SVN server . The excess appeared to be coming from the account the Subversion plugin was given to connect with.
We notice that svn+ssh connections are not closing and as a result will "leak" over time. During off hours (friday evening to Saturday morning) we saw a 20x increase in the number of open connections to SVN from the JIRA server.
The largest repo currently has 40k revisions, which is what we set the indexing threshold to cover.