Who has ever migrated a managed cluster from Managed to SAAS or from SAAS to Managed.
Is this possible and what is the effort required?
Does Dynatrace provide this capability?
This would be a good capability since we have clients already on Managed deployments and have a corrupted or inconsistent infrastructure and down the line they feel a need to shift to SAAS or vice versa
I do not know of any such migration. Heard only rumours about it. It would not be impossible, in my opinion, given how similar the two solutions seem to be, but would probably need significant Professional services. And it's going to get more difficult with Grail.
In any case, this is something that you should check with your account manager.
Depends on how much you need you historical data.
If you can live without it, you can copy most of the configuration via API and copy the few that require it manually. Then you can reconfigure the agents to report to the new environment.
It's quite doable, you loose all the historic data though.