Add pricing info to log drain feature page

apps/docs/content/guides/telemetry/log-drains.mdx

@@ -180,3 +180,7 @@ To setup DataDog log drain, generate a DataDog API key [here](https://app.datado
 </Accordion>
 
 If you are interested in other log drains, upvote them [here](https://github.com/orgs/supabase/discussions/28324)
+
+## Pricing
+
+For a detailed breakdown of how charges are calculated, refer to [Manage Log Drain usage](/docs/guides/platform/manage-your-usage/log-drains).