Issue Summary

From Jira 10.5, Jira Software 10.5.x release notes, "Email notification character change limit" feature was introduced. This feature was also part of bug fix for JRASERVER-65963.

The processing of the outgoing mail queue is single-threaded and can get delayed or stuck in case of notifications where it takes a long time to calculate changes in an issue. This is why we’ve added a limit to the maximum number of characters we’ll calculate the difference between the original and the new content for. If that limit is exceeded, the email notification will contain a message saying there are too many changes to display instead of showing the exact difference.

You can configure the character limit value via the jira.email.diff.max.characters system property.

By default, this limit is 10,000 characters. It would be great if there were an option to disable this check so users are still notified about the changes in email notification, rather than getting a message saying "there are too many changes to display."

Steps to Reproduce

1. Setup SMTP outgoing mail. Setup Notification scheme so users receives email for issue updated or issue commented event.
2. Create a new issue and add a comment. Notification is triggered to the users.
3. Edit the comment and add a content with more than 10000 characters.
4. Email notification will be triggered. In the notification, we see "there are too many changes to display" message instead of the exact changes.

Workaround

Increase the limit of jira.email.diff.max.characters system property to a higher number so the difference between original and new content is not crossing this limit.