Update release notes for v25.2-v25.2.8

Author: Automated Release Bot

src/current/_includes/releases/v25.2/v25.2.8.md

@@ -4,9 +4,22 @@ Release Date: October 30, 2025
 
 {% include releases/new-release-downloads-docker-image.md release=include.release %}
 
+<h3 id="v25-2-8-operational-changes">Operational changes</h3>
+
+- In order to selectively capture
+  traces for transactions running in an active workload without haing
+  to capture them via statement diagnostic bundles, customers can now
+  use the `sql.trace.txn.sample_rate` cluster setting to enable tracing
+  for a fraction of their workload. The `sql.trace.txn.enable_threshold`
+  will still need to be set to a positive value to provide a filter
+  for how slow a transaction needs to be after being sampled to merit
+  emitting a trace. Traces are emitted to the `SQL_EXEC` logging
+  channel. [#156409][#156409]
+
 <h3 id="v25-2-8-bug-fixes">Bug fixes</h3>
 
 - Fixed a bug in the `cockroach node drain` command where draining a node using virtual clusters (such as clusters running Physical Cluster Replication (PCR)) could return before the drain was complete, possibly resulting in shutting down the node while it still had active SQL clients and range leases. [#156312][#156312]
 
 
+[#156409]: https://github.com/cockroachdb/cockroach/pull/156409
 [#156312]: https://github.com/cockroachdb/cockroach/pull/156312