failedAt

When the entry skipped was parked (epoch milliseconds, the entry's failedAt), as the caller saw it: the owning service refuses the skip as me.ahoo.wow.api.result.FrameworkCodes.LEDGER_STALE when the entry it holds was parked at another time, resolved and parked again since. Required: a skip discards what was parked, so it names the parking it discards, never one nobody looked at.