Clean up attachment-*.tmp files in <confluence_install>/temp directory.

Summary

Many attachment-*.tmp files remain in <confluence_install>/temp after uploading attachment files to a Page with REST API.

Thousands of attachment-*.tmp files remain in <confluence_install>/temp directory.
Somethimes amount of total file sizes become several GB.
those files are not deleted by scheduled job, since the job deletes files in <confluence_home>/temp.

Environment

• Confluence 5.9.9

Steps to Reproduce

1. curl -v -S -u admin:password -X POST -H "X-Atlassian-Token: no-check" -F "file=@myfile.txt" -F "comment=this is my file" "http://localhost:8090/rest/api/content/<page id>/child/attachment" | python -mjson.tool
2. check <confluence_install>/temp directory.

Expected Results

Templory files should be deleted after completing the REST API.
or
A scheduled jos deletes them.

Actual Results

Templory files remain after competing REST API program.
And when Confluence is stopped, those tmp files are deleted.
This means those files maybe remain in temp directory for long term.

Workaround

restart conflunece, then those attachment-*.tmp files are deleted.