Issue tracking takes place on the Apache JIRA instance.
Committers needing developer-level access to JIRA should create an account there, then mail the developer list to request that your account be granted the needed permissions.
Commits that are targeted against issues on JIRA should start the log message with the JIRA id and title, followed by any additional comment, e.g.
Formatting the commits this way will allow JIRA to automatically pick them up and link them from the issue. For example: https://issues.apache.org/jira/browse/HTTPCLIENT-1024?page=com.atlassian.jira.plugin.ext.subversion:subversion-commits-tabpanel.