From 70de22e419a8cd44e45f50147b3499718edd4d00 Mon Sep 17 00:00:00 2001
From: Veeral Patel <veeral.patel@temporal.io>
Date: Thu, 9 Jul 2026 11:58:28 -0700
Subject: [PATCH] Add scale_decisions to WorkerPollerInfo

Adds a per-poller-type breakdown of poller autoscaler scale decisions
since the last heartbeat (keyed by reason, e.g. server_up,
server_up_suppressed, empty_poll_down, re_halve) to the worker heartbeat,
so scaling behavior is observable server-side without a metrics pipeline.
---
 temporal/api/worker/v1/message.proto | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/temporal/api/worker/v1/message.proto b/temporal/api/worker/v1/message.proto
index a87142c78..b8e06c904 100644
--- a/temporal/api/worker/v1/message.proto
+++ b/temporal/api/worker/v1/message.proto
@@ -22,6 +22,11 @@ message WorkerPollerInfo {
 
   // Set true if the number of concurrent pollers is auto-scaled
   bool is_autoscaling = 3;
+
+  // Counts of poller autoscaler scale decisions since the last heartbeat, keyed by
+  // reason (e.g. "server_up", "server_up_suppressed", "empty_poll_down", "re_halve").
+  // Only set when the poller count is auto-scaled.
+  map<string, int64> scale_decisions = 4;
 }
 
 message WorkerSlotsInfo {