This object preserves the previous health verdict for the same category and sub-category, distinct from the live current status reported elsewhere in this row. Keeping the prior value lets an admin, or an automated script, detect a meaningful state transition -- for example degraded flipping to healthy -- simply by comparing this against the current status, rather than only ever seeing the latest snapshot with no history. For example, seeing this object report degraded while the current status object now reports healthy confirms a recent recovery event rather than an ongoing, unresolved problem.