Looks like recent JIRA auto-posts include gitbox links, e.g. https://issues.apache.org/jira/browse/SOLR-13051?focusedCommentId=16740737&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16740737

+1 to ask Infra for an auto redirect for the links in all the existing JIRA comments.

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Steve