FEED.TAILReturn a shard's current feed generation and next offset.
| 语法 | FEED.TAIL shard |
| 分组 | feed |
| 参数个数 | 2 |
| 起始版本 | 3.0.0 |
| 标志 | readonly, extension |
| 复杂度 | O(1) on a single shard |
| Redis 兼容性 | kevy-only: nearest is INFO replication's master_repl_offset, which is not a resumable per-shard CDC cursor |