sayakpaul · Aug 22, 2026 · Aug 14, 2026 · Aug 14, 2026 · Aug 18, 2026 · Aug 18, 2026
diff --git a/.github/workflows/pr_link_issue_reminder.yml b/.github/workflows/pr_link_issue_reminder.yml
@@ -7,8 +7,11 @@ on:
 
 jobs:
   remind:
-    # Reminds external contributors to link an issue. PRs from maintainers, users
-    # with write/admin access, and collaborators are skipped by the script.
+    # Reminds external contributors to link an issue, reports still-unlinked PRs to
+    # Slack (one message per PR, sent once) 5 days after the reminder, and auto-closes
+    # them 10 days after the reminder unless rescued (issue linked or `no-issue-needed`
+    # label added). PRs from maintainers, users with write/admin access, and collaborators
+    # are skipped by the script.
     name: Remind external contributors to link an issue
     if: github.repository == 'huggingface/diffusers'
     runs-on: ubuntu-22.04
@@ -18,6 +21,10 @@ jobs:
       issues: write
     env:
       GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL_PR_LINK_ISSUE }}
+      # Comma-separated Slack member IDs pinged in the Slack rescue messages
+      # (Sayak Paul, YiYi Xu, Dhruv Nair, Daniel Gu).
+      SLACK_MENTION_IDS: ${{ secrets.SLACK_PR_LINK_ISSUE_MENTION_IDS }}
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
 

diff --git a/utils/remind_link_issue.py b/utils/remind_link_issue.py
@@ -12,14 +12,24 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 """
-Script to remind PR authors to link an issue.
+Script to remind PR authors to link an issue, and to escalate unresolved reminders.
 
 Behavior:
 - Scans open, non-draft PRs.
 - A PR is considered "linked" if GitHub's GraphQL `closingIssuesReferences` returns > 0
   (covers both `Fixes #N` keywords in the body and issues linked via the GitHub UI).
-- If a PR is not linked and no prior reminder is present, the script posts a single
-  friendly reminder comment.
+- If a PR is not linked and has no reminder yet, the script posts a single friendly
+  reminder comment warning that the PR may be auto-closed.
+- If a PR only has an old-style reminder (posted before the auto-close notice existed),
+  the script posts a single follow-up carrying the notice instead, so those PRs enter
+  the same escalation path with the full warning window.
+- Once the warning is `SLACK_RESCUE_DAYS` old and the PR is still not linked, it is
+  reported to Slack (one message per PR, so each can be tracked individually) for
+  maintainers to rescue it (by linking an issue or adding the `no-issue-needed` label).
+  Each PR is reported exactly once, so a PR the team decided not to rescue does not
+  come back on every run.
+- Once the warning is `AUTOCLOSE_DAYS` old and the PR is still not linked, the PR is
+  closed with an explanatory comment.
 - PRs labeled `no-issue-needed` and bot-authored PRs are skipped.
 - PRs authored by maintainers, users with write (or admin) access, and collaborators
   are skipped; the reminder only targets external contributors.
@@ -38,8 +48,23 @@
 
 REPO = "huggingface/diffusers"
 REMINDER_MARKER = "<!-- pr-link-issue-reminder -->"
+# Present only in comments that warn about auto-closure; the escalation clock starts
+# from the bot comment carrying this marker.
+AUTOCLOSE_MARKER = "<!-- pr-link-issue-autoclose -->"
+# Appended to the warning comment once the PR has been reported to Slack, so it is
+# reported exactly once instead of on every run of the rescue window.
+SLACK_NOTIFIED_MARKER = "<!-- pr-link-issue-slack-notified -->"
+# Login the reminder comments are authored under (the workflow's GITHUB_TOKEN).
+BOT_LOGIN = "github-actions[bot]"
 BYPASS_LABELS = {"no-issue-needed"}
-LOOKBACK_DAYS = 2
+# Days after the warning at which a still-unlinked PR is reported to Slack for rescue.
+# Kept well ahead of `AUTOCLOSE_DAYS` so the single Slack message leaves maintainers a
+# few working days to react (a message sent on a Friday still gets a mid-week reply).
+SLACK_RESCUE_DAYS = 5
+# Days after the warning at which a still-unlinked PR is automatically closed.
+AUTOCLOSE_DAYS = 10
+# Upper bound on how far back to paginate open PRs; older PRs are left alone.
+SCAN_LOOKBACK_DAYS = 30
 # Collaborator permission levels that mark a PR author as a maintainer / writer /
 # collaborator. Authors with any of these are skipped (the reminder is only for
 # external contributors).
@@ -89,10 +114,6 @@ def author_checkbox_checked(pr):
     return bool(AUTHOR_CHECKBOX_PATTERN.search(pr.body or ""))
 
 
-def has_existing_reminder(pr):
-    return any(REMINDER_MARKER in (c.body or "") for c in pr.get_issue_comments())
-
-
 def is_privileged_author(repo, pr, author):
     """Return True if the author is a maintainer, has write/admin access, or is a collaborator."""
     # `author_association` is on the PR payload and needs no extra token scope.
@@ -113,21 +134,85 @@ def is_privileged_author(repo, pr, author):
 def reminder_body(author):
     return (
         f"{REMINDER_MARKER}\n"
+        f"{AUTOCLOSE_MARKER}\n"
         f"Hi @{author}, thanks for the PR! It does not appear to link an issue it fixes. "
         "If this PR addresses an existing issue, please add a closing keyword "
         "(e.g. `Fixes #1234`) to the PR description so the issue is linked. "
         f"See the [contribution guide]({CONTRIBUTION_GUIDE_URL}) for more details. "
         "If this PR intentionally does not fix a tracked issue, a maintainer can "
-        "add the `no-issue-needed` label to silence this reminder."
+        "add the `no-issue-needed` label to silence this reminder.\n\n"
+        f"**Please note that PRs without a linked issue are likely to be automatically "
+        f"closed {AUTOCLOSE_DAYS} days after this notice.**\n\n"
+        "Once the PR links an issue (or gets the `no-issue-needed` label), you can ignore "
+        "this message \u2014 it stays here as a comment, but it no longer applies."
+    )
+
+
+def followup_body(author):
+    return (
+        f"{AUTOCLOSE_MARKER}\n"
+        f"Hi @{author}, a follow-up on the reminder above: this PR still does not link "
+        "an issue it fixes.\n\n"
+        f"**Please note that PRs without a linked issue are likely to be automatically "
+        f"closed {AUTOCLOSE_DAYS} days after this notice.** Adding a closing keyword "
+        "(e.g. `Fixes #1234`) to the PR description, or a maintainer adding the "
+        "`no-issue-needed` label, will prevent that."
+    )
+
+
+def autoclose_body():
+    return (
+        "This PR has been automatically closed because it does not link an issue and "
+        f"the reminder above was not addressed within {AUTOCLOSE_DAYS} days. "
+        "If this PR is still relevant, please link the issue it fixes "
+        "(e.g. `Fixes #1234`) or ask a maintainer to add the `no-issue-needed` label, "
+        "and it can be reopened.\n\n"
+        "We are experimenting with this process to keep the review queue manageable, "
+        "and it will sometimes get it wrong. If you think this PR should stay open, "
+        "please just say so here and we will reopen it \u2014 no need to justify it at length.\n\n"
+        "Thanks again for contributing, and sorry for the noise if we closed this by mistake!"
     )
 
 
+def post_to_slack(webhook_url, text):
+    response = requests.post(webhook_url, json={"text": text}, timeout=30)
+    response.raise_for_status()
+
+
+def mark_slack_notified(warning):
+    """Append the notified marker to the warning comment so the PR is not reported again."""
+    warning.edit(f"{warning.body or ''}\n{SLACK_NOTIFIED_MARKER}")
+
+
+def send_slack_rescue_messages(webhook_url, mention_ids, at_risk):
+    """Post one header message plus one message per PR, so each PR can be tracked
+    individually (e.g. with a ✅ reaction once handled). Each PR is reported once."""
+    header = (
+        f"⚠️ {len(at_risk)} open PR(s) without a linked issue will be auto-closed soon. "
+        "Link an issue or add the `no-issue-needed` label to rescue them:"
+    )
+    if mention_ids:
+        header = "cc " + " ".join(f"<@{mid}>" for mid in mention_ids) + "\n" + header
+    post_to_slack(webhook_url, header)
+    for pr, warning, days_left in at_risk:
+        post_to_slack(
+            webhook_url, f"<{pr.html_url}|#{pr.number} {pr.title}> by `{pr.user.login}` — closes in {days_left} day(s)"
+        )
+        mark_slack_notified(warning)
+
+
 def main():
     token = os.environ["GITHUB_TOKEN"]
+    slack_webhook_url = os.getenv("SLACK_WEBHOOK_URL")
+    # Comma-separated Slack member IDs (e.g. "U0123ABC,U0456DEF") pinged in the Slack rescue messages.
+    mention_ids = [m.strip() for m in os.getenv("SLACK_MENTION_IDS", "").split(",") if m.strip()]
     g = Github(token)
     repo = g.get_repo(REPO)
     owner, name = REPO.split("/", 1)
-    cutoff = datetime.now(timezone.utc) - timedelta(days=LOOKBACK_DAYS)
+    now = datetime.now(timezone.utc)
+    scan_cutoff = now - timedelta(days=SCAN_LOOKBACK_DAYS)
+    # (pr, warning_comment, days_left) triples reported to Slack for rescue.
+    at_risk = []
 
     try:
         pulls = repo.get_pulls(state="open", sort="created", direction="desc")
@@ -136,9 +221,9 @@ def main():
                 created_at = pr.created_at
                 if created_at.tzinfo is None:
                     created_at = created_at.replace(tzinfo=timezone.utc)
-                # PRs are sorted newest-first, so once we cross the cutoff every
+                # PRs are sorted newest-first, so once we cross the scan cutoff every
                 # remaining PR is older too and we can stop paginating.
-                if created_at < cutoff:
+                if created_at < scan_cutoff:
                     break
                 if pr.draft:
                     continue
@@ -156,16 +241,48 @@ def main():
                     continue
                 if has_linked_issue(token, owner, name, pr.number):
                     continue
-                if has_existing_reminder(pr):
+                comments = list(pr.get_issue_comments())
+                # Only a marker comment authored by the bot itself starts the
+                # escalation clock; a pasted marker in a user comment does not.
+                warning = next(
+                    (
+                        c
+                        for c in comments
+                        if AUTOCLOSE_MARKER in (c.body or "") and c.user is not None and c.user.login == BOT_LOGIN
+                    ),
+                    None,
+                )
+                if warning is None:
+                    # A PR with only an old-style reminder (without the auto-close
+                    # notice) gets a follow-up carrying the notice; the escalation
+                    # clock starts from whichever comment carries the marker.
+                    already_reminded = any(REMINDER_MARKER in (c.body or "") for c in comments)
+                    pr.create_issue_comment(followup_body(author) if already_reminded else reminder_body(author))
                     continue
-                pr.create_issue_comment(reminder_body(author))
+                warned_at = warning.created_at
+                if warned_at.tzinfo is None:
+                    warned_at = warned_at.replace(tzinfo=timezone.utc)
+                days_since_warning = (now - warned_at).days
+                if days_since_warning >= AUTOCLOSE_DAYS:
+                    pr.create_issue_comment(autoclose_body())
+                    pr.edit(state="closed")
+                elif days_since_warning >= SLACK_RESCUE_DAYS and SLACK_NOTIFIED_MARKER not in (warning.body or ""):
+                    at_risk.append((pr, warning, AUTOCLOSE_DAYS - days_since_warning))
             except Exception as e:
                 logger.warning("Skipping PR #%s: %s", getattr(pr, "number", "?"), e)
                 continue
     except Exception as e:
         logger.error("Failed to fetch open PRs: %s", e)
         raise
 
+    if at_risk:
+        if slack_webhook_url:
+            send_slack_rescue_messages(slack_webhook_url, mention_ids, at_risk)
+        else:
+            logger.warning(
+                "SLACK_WEBHOOK_URL is not set; skipping rescue messages for %d at-risk PR(s).", len(at_risk)
+            )
+
 
 if __name__ == "__main__":
     logging.basicConfig(level=logging.INFO, format="%(asctime)s %(levelname)s %(message)s")