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docs(web-panel): document stats history caps and SD archive behaviour

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Jared Dohrman
2026-04-16 21:32:27 +10:00
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@@ -204,6 +204,25 @@ This keeps browser-side and device-side memory use lower than the previous in-pa
If `web.stats` is enabled and an SD archive is mounted, trends can restore archived summary points after reboot. Recent live points are still added from in-memory history.
### Stats History Capacity
Stats samples are collected once per minute.
Current in-memory history caps are:
| Board class | Sample cap | Event cap | Approx. sampled history |
| ------------------------------ | ---------: | --------: | ------------------------ |
| No PSRAM | `24` | `8` | Live-only recent history |
| Less than `4MB` PSRAM | `240` | `96` | About `4` hours |
| `4MB` to less than `8MB` PSRAM | `480` | `192` | About `8` hours |
| `8MB` PSRAM or more | `720` | `288` | About `12` hours |
Archive-backed restore requires `web.stats` enabled plus a mounted SD card on boards that support the EastMesh archive path.
The main purpose of the SD card is to let the repeater retain and restore stats history for `/stats`. As a secondary option, the archive files can also be removed and inspected on a computer for deeper manual review.
On no-PSRAM boards, `/stats` can still show recent graphs while the stats view is active, but the history is smaller and does not provide the same archive-backed behaviour as PSRAM-capable boards.
Useful CLI commands:
- `set web.stats on`