[Logpush] add limitation note about subrequest merging for latest CDN proxy (#30189)

* [Logpush] add limitation note about subrequest merging for latest CDN proxy

* changed wording and converted limitation to note

---------

Co-authored-by: Andrew Depke <adepke@cloudflare.com>

Author: adepke

src/content/changelog/logs/2026-04-21-logpush-subrequests-merging.mdx

@@ -15,4 +15,5 @@ When a Cloudflare Worker intercepts a visitor request, it can dispatch additiona
 - A maximum of 50 subrequests are merged per parent request. Subrequests beyond this limit are passed through unmodified as individual log entries.
 - Subrequests must complete within 5 minutes of the visitor request. Subrequests that exceed this window are passed through unmodified.
 - Subrequests that do not qualify appear as separate log entries — no data is lost.
+- Subrequest merging is being gradually rolled out and is not yet available on all zones. Contact your account team for concerns or to ensure it is enabled for your zone.
 - For more information, refer to [Subrequests](/logs/logpush/logpush-job/subrequests/).

src/content/docs/logs/logpush/logpush-job/subrequests.mdx

@@ -34,6 +34,9 @@ Subrequest merging is an opt-in feature on the http_requests dataset. With subre
 ## Merging Eligibility
 - A maximum of 50 subrequests are merged per parent request. Subrequests beyond this limit are passed through unmodified as individual log entries.
 - Subrequests must complete within 5 minutes of the visitor request. Subrequests that exceed this window are passed through unmodified.
+:::note
+Subrequest merging is being gradually rolled out and is not yet available on all zones. Contact your account team for concerns or to ensure it is enabled for your zone.
+:::
 
 ## New log field
 When subrequest merging is enabled, a `Subrequests` field (`array<object>`) is added to each parent request log record. Each element in the array contains the standard http_requests fields for that subrequest.