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Re-applies the monitor consumer portion of #111464 (reverted in 7e509b5).
The revert was caused by a
pymemcache.HashClient._retry_dead()race condition — Django'sCacheHandlerstores connections in a contextvar, andcopy_context()caused all worker threads to share a single non-thread-safeHashClient. This is fixed by #111545, which gives each thread its own client.Depends on #111545.
Agent transcript: https://claudescope.sentry.dev/share/bXndRR4KT3FDez_xnzf1nwcoicOkmF93CYhAl-bcoKY