From a41a51fe48c9865c1da39b9bb3336366c96ffb43 Mon Sep 17 00:00:00 2001
From: Jesse Glick <jglick@cloudbees.com>
Date: Thu, 8 Oct 2026 04:32:30 +0100
Subject: [PATCH] Log stack traces for `OldDataMonitor.report` on `Run`
 (#27500)

* Log stack straces for `OldDataMonitor.report` on `Run`

* Ignore `ReportException` https://github.com/jenkinsci/jenkins/pull/27500#discussion_r4195992415

* Reduce messages to `FINE` so they can be collected if and when desired https://github.com/jenkinsci/jenkins/pull/27500#discussion_r4196269765
---
 core/src/main/java/hudson/diagnosis/OldDataMonitor.java | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/core/src/main/java/hudson/diagnosis/OldDataMonitor.java b/core/src/main/java/hudson/diagnosis/OldDataMonitor.java
index 94cb6d2ea9..ec2a653d4e 100644
--- a/core/src/main/java/hudson/diagnosis/OldDataMonitor.java
+++ b/core/src/main/java/hudson/diagnosis/OldDataMonitor.java
@@ -185,6 +185,11 @@ public class OldDataMonitor extends AdministrativeMonitor {
      */
     public static void report(Saveable obj, Collection<Throwable> errors) {
         if (obj instanceof Run<?, ?>) {
+            if (LOGGER.isLoggable(Level.FINE)) {
+                for (var error : errors) {
+                    LOGGER.log(Level.FINE, "Trouble loading " + obj, error);
+                }
+            }
             return; // somewhat ephemeral
         }
         StringBuilder buf = new StringBuilder();