Today when you change SAL configuration it can have dramatic effects about what SLA's are running or not.

For general support reasons we should have a "history audit" of the SLA configurations that are in place at a given point in time.

This would be all the configuration and when it applied.

This could then be used by admins and atlassian support to debug how the configuration has changed and how it should be applied to current and past issues.

Also we could have an issue history record that says WHEN an given SLA configuration was being applied to an issue and when new ones are overriding it (eg when we drop an SLA timer because of a config change)

This would also help for support reasons.