There are a few limits on the number of versions and spaces that can be synchronized within Version Sync for Jira:
1. A sync group can only contain up to 500 spaces
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The 500 spaces limit is clearly communicated once you try to add a 501st space to a sync group.
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This applies to both two-way and one-way sync groups.
2. Only up to 10,000 versions in a space may be synced within a sync group
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No versions are being deleted due to this limit, just “unsynced”, i.e. they are no longer synced to other spaces in their sync group.
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The 10,000 versions limit cannot be communicated on the UI, since you might add the 10,001st version on the Jira “Create version” dialog where we’re not able to display any errors.
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Instead, we have a regularly running background job, that will ensure that only 10,000 versions within a space are synced within a sync group. We will always unsync the version with the lowest ID, which translates to the earliest created version that will be unsynced.
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This ensures that newer versions will always be synced and hopefully only very old versions are no longer being synced, which are unlikely to change.
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If we unsync any versions due to this limit, it will be communicated in the Activity Log.