8309693: Synchronize openjdk/shenandoah:master with changes made for PR

Reviewed-by: kdnilsen, ysr

Author: William Kemper

.jcheck/conf

@@ -1,10 +1,10 @@
 [general]
-project=shenandoah
+project=jdk
 jbs=JDK
 version=21
 
 [checks]
-error=author,committer,reviewers,executable,symlink,message,hg-tag,whitespace,problemlists
+error=author,committer,reviewers,merge,issues,executable,symlink,message,hg-tag,whitespace,problemlists
 
 [repository]
 tags=(?:jdk-(?:[1-9]([0-9]*)(?:\.(?:0|[1-9][0-9]*)){0,4})(?:\+(?:(?:[0-9]+))|(?:-ga)))|(?:jdk[4-9](?:u\d{1,3})?-(?:(?:b\d{2,3})|(?:ga)))|(?:hs\d\d(?:\.\d{1,2})?-b\d\d)
@@ -18,12 +18,18 @@ domain=openjdk.org
 files=.*\.cpp|.*\.hpp|.*\.c|.*\.h|.*\.java|.*\.cc|.*\.hh|.*\.m|.*\.mm|.*\.md|.*\.gmk|.*\.m4|.*\.ac|Makefile
 ignore-tabs=.*\.gmk|Makefile
 
+[checks "merge"]
+message=Merge
+
 [checks "reviewers"]
-committers=1
+reviewers=1
 ignore=duke
 
 [checks "committer"]
 role=committer
 
+[checks "issues"]
+pattern=^([124-8][0-9]{6}): (\S.*)$
+
 [checks "problemlists"]
 dirs=test/jdk|test/langtools|test/lib-test|test/hotspot/jtreg|test/jaxp