Item of postmortem: WRITING-39580

• Trace ChangeVersion → StopMongoWithTimeout and document the effective shutdown command.
• Confirm whether mongos ever receives shutdown: 1, force: false; current code treats mongos as unable to perform the graceful-shutdown precondition and falls back to force: true. https://github.com/10gen/mms-automation/blob/master/go_planner/src/com.tengen/cm/mongoctl/processctl.go
• Validate MongoDB’s expected force:false behavior: mongos should quiesce, continue existing operations, and route new operations to other routers. https://github.com/10gen/mongo/blob/master/src/mongo/s/commands/cluster_shutdown_cmd.cpp https://github.com/mongodb/docs/blob/main/content/manual/v8.2/source/reference/command/shutdown.txt