rw_concern_d is a mongod-specific library but appears to wind up as a dependency in libraries, such as service_entry_point_common, sharding_catalog_manager, and transaction_coordinator, which are not mongod-specific.

As a result, statically compiling the mongos leads to all symbols in rw_concern_d being included in the binary. This is incorrect because, among other things, it links the JournalFlusher into the mongos and has caused problems when adding new code (TTLMonitor with ServerStatusMetricField instances) to the storage control API (the storage_control library is a dependency of rw_concern_d).

We should aim to remove the mongos dependency on rw_concern_d.