The logic for emitting/logging command events lives in execute_operation_on_connection, which gets called in the operation execution path in executor.rs. However, some commands sent by the driver call connection.send_message directly, meaning no events/logs are emitted. For example, the OIDC code sends saslStart using connection.send_message (https://github.com/mongodb/mongo-rust-driver/blob/799f32333b46c3a39d0af14376370df4173d41d7/src/client/auth/oidc.rs#L913). This means we cannot monitor these events for tests. We should either a) route all messages through the executor or b) move command event logging/emitting to send_message.