From e194cb90df750819e17a698e1e5e6f31c8889c7f Mon Sep 17 00:00:00 2001
From: Aditya Mukhopadhyay <webmaster@adityamukho.com>
Date: Tue, 13 Oct 2026 10:25:57 +0530
Subject: [PATCH] ci(bench): name the branch in every regression issue

Issues for main were titled "Benchmark regression: <suite>" with no
branch, while v3 issues carried "(v3)". Title every issue
"Benchmark regression: <suite> (<branch>)", like the nightly fuzz
issue, and add a Branch line to the body. An open issue with the old
main title is still matched, renamed and commented on.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HyLscCUuJ1GQpdAeX79EdR
---
 .github/workflows/bench.yml | 30 ++++++++++++++++++++----------
 1 file changed, 20 insertions(+), 10 deletions(-)

diff --git a/.github/workflows/bench.yml b/.github/workflows/bench.yml
index 05af0de9f..6a46e9120 100644
--- a/.github/workflows/bench.yml
+++ b/.github/workflows/bench.yml
@@ -266,10 +266,11 @@ jobs:
 
       # Shared CI runners are noisy, so one alert on its own is usually a slow
       # runner, not a regression. Report only benchmarks that also alerted in
-      # this suite on the previous run. Each suite has its own issue: if one is
-      # open, add a comment to it instead of skipping. Every outcome, including
-      # an alert that is not reported, goes in the job summary, because the
-      # Bencher step is continue-on-error and the run stays green (#393).
+      # this suite on the previous run. Each suite and branch has its own issue,
+      # titled with the branch like the nightly fuzz issue: if one is open, add
+      # a comment to it instead of skipping. Every outcome, including an alert
+      # that is not reported, goes in the job summary, because the Bencher step
+      # is continue-on-error and the run stays green (#393).
       - name: Report regression
         if: steps.bencher.outcome == 'failure'
         uses: actions/github-script@v9
@@ -282,8 +283,7 @@ jobs:
             const suite = process.env.SUITE;
             const ref = process.env.BENCH_REF;
             const jobName = `bench / ${suite}`;
-            // main keeps its existing issue titles; other branches get their own.
-            const label = ref === 'main' ? suite : `${suite}, ${ref}`;
+            const label = `${suite}, ${ref}`;
 
             // Bencher lists each alert as "- <benchmark> (Latency): <.../alerts/<id>>".
             // The "View results" lines use /perf? URLs, so they do not match.
@@ -300,6 +300,7 @@ jobs:
               body = [
                 `Bencher failed in the nightly benchmark run (${label}) but listed no alerts. This is likely an API or upload error.`,
                 '',
+                `**Branch:** \`${ref}\``,
                 `**Run:** ${runUrl}`,
               ].join('\n');
             } else {
@@ -358,6 +359,7 @@ jobs:
                 '',
                 ...repeated.map(b => `- \`${b}\``),
                 '',
+                `**Branch:** \`${ref}\``,
                 `**Run:** ${runUrl}`,
                 `**Previous run:** ${previousUrl}`,
                 '',
@@ -371,12 +373,20 @@ jobs:
               state: 'open',
               per_page: 100,
             });
-            const title = ref === 'main'
-              ? `Benchmark regression: ${suite}`
-              : `Benchmark regression: ${suite} (${ref})`;
-            const existing = openIssues.find(i => !i.pull_request && i.title === title);
+            const title = `Benchmark regression: ${suite} (${ref})`;
+            // Issues for main used to be titled without the branch. Keep
+            // commenting on such an open issue, and give it the new title.
+            const legacyTitle = ref === 'main' ? `Benchmark regression: ${suite}` : null;
+            const existing =
+              openIssues.find(i => !i.pull_request && i.title === title) ||
+              openIssues.find(i => !i.pull_request && legacyTitle && i.title === legacyTitle);
             let reported;
             if (existing) {
+              if (existing.title !== title) {
+                await github.rest.issues.update({
+                  owner, repo, issue_number: existing.number, title,
+                });
+              }
               await github.rest.issues.createComment({
                 owner, repo, issue_number: existing.number, body,
               });