I use sentry 8.0.6 with redis 3.0.7 as a celery broker. Celery is running with -B flag.
I see warning Background workers haven't checked in recently. This can mean an issue with your configuration or a serious backlog in tasks. if the sentry for a long time does not receive an error notification from clients. Immediately after receiving the error, the warning disappears.
Problem appeared after upgrade from sentry 7.7.4.