[llvm] [CI] Add metrics for MacOS jobs (PR #218154)

[Aiden Grossman via llvm-commits]

https://github.com/boomanaiden154 created https://github.com/llvm/llvm-project/pull/218154

So we can plumb them into the Grafana dashboard.

>From 8d8319b0a6334134226d67a48b0f7b76b63b7d68 Mon Sep 17 00:00:00 2001
From: Aiden Grossman <aidengrossman at google.com>
Date: Sat, 22 Aug 2026 18:19:26 +0000
Subject: [PATCH] [CI] Add metrics for MacOS jobs

So we can plumb them into the Grafana dashboard.
---
 .ci/metrics/metrics.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/.ci/metrics/metrics.py b/.ci/metrics/metrics.py
index 3785e205d8360..68e456fa7718c 100644
--- a/.ci/metrics/metrics.py
+++ b/.ci/metrics/metrics.py
@@ -42,6 +42,7 @@
         "Build and Test Linux": "premerge_linux",
         "Build and Test Linux AArch64": "premerge_linux_aarch64",
         "Build and Test Windows": "premerge_windows",
+        "Build and Test macOS arm64": "premerge_macos",
     },
     "github_libcxx_premerge_checks": {
         "stage1": "premerge_libcxx_stage1",