This object reports how many rules failed the last time this check was performed, based on entries in the corresponding checkFailureTable, or 0 if the check has never run. An admin uses this as a quick failure-count summary per check before drilling into checkFailureTable to see exactly which specific rules failed, useful for prioritizing which checks deserve closer investigation first. A check reporting this object as 4 out of, say, 10 total configured rules tells the admin 6 rules still passed, narrowing down how broadly that check's underlying condition has degraded.