Document 30-day retention for telemetry events

browsers/telemetry/categories.mdx

@@ -53,7 +53,7 @@ Telemetry is off by default and the default set carries operational metadata onl
 | `screenshot` | A full rendered image of the page - the broadest exposure, capturing anything visible on screen. |
 | `control`, `connection`, `system`, `captcha`, `monitor` | Session metadata only (control calls, connection and health events). No page content. |
 
-Captured events are persisted and can be replayed by [resuming the stream](/browsers/telemetry/streaming#resuming-after-a-disconnect), so this sensitivity applies to the data at rest, not just the live stream. Treat captured telemetry - and anywhere you forward or store it - with the same care as the underlying content. For how Kernel encrypts, retains, and processes data overall, see [Security](/security) and the [Data Processing Addendum](/dpa).
+Captured events are persisted and can be replayed by [resuming the stream](/browsers/telemetry/streaming#resuming-after-a-disconnect), so this sensitivity applies to the data at rest, not just the live stream. Events are retained for 30 days, then expired (see [Retention](/browsers/telemetry/overview#retention)). Treat captured telemetry - and anywhere you forward or store it - with the same care as the underlying content. For how Kernel encrypts, retains, and processes data overall, see [Security](/security) and the [Data Processing Addendum](/dpa).
 
 Some exposure is reduced for you automatically: input into sensitive fields such as passwords is suppressed (`interaction_key` isn't emitted for them, and `interaction_click` omits the element text). Beyond that, because selection is opt-in, the most effective control is to capture only the categories you need - enable `network`, `console`, `page`, `interaction`, or `screenshot` deliberately, and prefer the operational categories when you only need session health.
 

browsers/telemetry/overview.mdx

@@ -108,6 +108,10 @@ kernel browsers update <session-id> --telemetry=off
 On update, a category list patches the current selection - categories you don't include keep their current state. To reset the selection instead, send `enabled: true` (it replaces the selection with the categories you provide, or the default set if you provide none); send `enabled: false` to turn telemetry off.
 </Info>
 
+## Retention
+
+Captured events are retained for 30 days, then expired. You can [stream](/browsers/telemetry/streaming) events live or pull them later for analysis within that window; after 30 days the events are no longer available.
+
 ## What's next
 
 - [Categories](/browsers/telemetry/categories) - every category, what it captures, the default set, and cost characteristics.