This object sets the maximum number of history entries retained per ping test in eriRouterPingHistoryTable, defaulting to 12; the oldest entry is removed once this limit is reached, all entries are removed if the parent pingCtlTable row is deleted, and a value of 0 disables history entirely for that test. Admins raise this to retain a longer run of past results for trend analysis, or set it to 0 if they don't need historical ping data stored for a given test. Setting this to 50 for a critical monitoring test retains the last 50 completed runs' results instead of just the default 12.