XINFOIntrospect a stream, its groups, or its consumers.
| 语法 | XINFO STREAM key | GROUPS key | CONSUMERS key group | HELP |
| 分组 | stream |
| 参数个数 | -2 |
| 起始版本 | 1.0.0 |
| 标志 | readonly |
| 复杂度 | STREAM: O(1). GROUPS: O(G*N) — 'lag' is a linear walk of every entry, once per group. CONSUMERS: O(C) |
| Redis 兼容性 | differs: STREAM / GROUPS / CONSUMERS / HELP only — XINFO STREAM FULL is absent; radix-tree-keys and nodes are synthetic (we have no radix tree), entries-read is approximated, and CONSUMERS omits 'inactive' |