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[ML] Store failure reason in ML job task status #34431
At present if an ML job fails then its persistent task is not deleted, but remains in the cluster state with a status of
It would be relatively easy to store the
The only problem with making this change is BWC of the job task status. If it is strictly parsed in 6.0 or above then 6.7 needs to be changed to leniently ignore unknown fields from the job task status and the new exception field can only be added in 7.0.