Internal change

PiperOrigin-RevId: 919619611

Author: JasonLunn

content/support/debugging-playbook.md

@@ -10,7 +10,7 @@ users.
 
 <!--*
 # Document freshness: For more information, see go/fresh-source.
-freshness: { owner: 'sangki' reviewed: '2025-02-11' }
+freshness: { owner: 'sangki' reviewed: '2026-05-18' }
 *-->
 
 ## Bazel: Resolving Issues with Prebuilt Protoc {#prebuilt-protoc}
@@ -43,3 +43,15 @@ bazel cquery 'somepath("//...", "@com_google_protobuf//:all")'
 
 **Note:** Prebuilts are only available for our standard set of platforms. Anyone
 on a nonstandard platform will have to build protoc from source.
+
+## Protostats Flume Pipeline
+
+The Protostats pipeline runs on borg through a Plx workflow defined by files in
+google3/net/proto2/tools/internal/protostats and it requires quota to run. The
+quota is taken from the `gpi-flex-pool`. Currently, Borg quota is registered for
+the `protobuf-stats` user in 3 different cells: `yq`, `viatlrb`, and `vibrura`.
+The latter are go/virtual-cells. The cell diversity and the use of virtual cells
+are both intended to provide redundancy against stockouts caused by real
+resource constraints or the occasional DiRT exercise. If registration needs to
+be adjusted, see directions in
+google3/net/proto2/tools/internal/protostats/BUILD.