Limit the number of comments in an issue

Issue Summary

It would be great if Jira could have a configurable limit on the number of comments that can be made on issues, to avoid issues like performance and rendering when an issue has too many comments.

Perhaps we should have a setting where you can set a maximum number of comments created per time unit (say minute) after which point you need to enter a captcha to unlock the account.

Note on fix

• In Jira 9.0.0 we introduced Safeguards for issue comments:
  • Safeguards allow System Administrators to moderate a user group’s activity by setting a global limit on the number of specific items its members can create. For example, if you rely heavily on automation, you can limit the number of comments a bot account can add to an issue, which can help boost the performance of loading the issue view. Details: Moderating user group activity with Safeguards
  • Note: this feature is not backported to 8.20.12
• Also to mitigate the problem, in Jira 9.0.0/8.22.4/8.20.12 we have introduced per issue limits related to the number of indexed comments, worklogs and history. Problem & solution description:
  • https://community.developer.atlassian.com/t/safeguards-in-jira-dc-index
  • https://community.atlassian.com/t5/Data-Center-articles/Introducing-Safeguards-for-Jira-index/ba-p/2037880#M433
  • https://confluence.atlassian.com/jirakb/jira-indexing-limits-stats-1125876330.html