ashb commented on a change in pull request #11970:
URL: https://github.com/apache/airflow/pull/11970#discussion_r522244600



##########
File path: airflow/www/app.py
##########
@@ -70,8 +71,22 @@ def create_app(config=None, testing=False, 
app_name="Airflow"):
     flask_app = Flask(__name__)
     flask_app.secret_key = conf.get('webserver', 'SECRET_KEY')
 
-    session_lifetime_days = conf.getint('webserver', 'SESSION_LIFETIME_DAYS', 
fallback=30)
-    flask_app.config['PERMANENT_SESSION_LIFETIME'] = 
timedelta(days=session_lifetime_days)
+    if conf.has_option('webserver', 'SESSION_LIFETIME_DAYS') or 
conf.has_option(
+        'webserver', 'FORCE_LOG_OUT_AFTER'
+    ):
+        logging.error(
+            '`SESSION_LIFETIME_DAYS` option from `webserver` section has been '
+            'renamed to `SESSION_LIFETIME_MINUTES`. New option allows to 
configure '
+            'session lifetime in minutes. FORCE_LOG_OUT_AFTER option has been 
removed '
+            'from `webserver` section. Please update your configuration.'
+        )
+        # Stop gunicorn server 
https://github.com/benoitc/gunicorn/blob/20.0.4/gunicorn/arbiter.py#L526
+        sys.exit(4)

Review comment:
       NOOOOOOOOO. Upgrade, don't error.




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