When a client connects to a MongoDB server, it first runs a hello command as part of the MongoDB handshake. As part of processing this initial command, the server should log the following measurements in a single "hello completed" log line:

-> What time the command was received

-> Duration of processing/running the command

-> Duration of sinking the response back to the network

-> Code given as response to the command ("ok")

These measurements will help us diagnose bottlenecks/issues in ingress connection establishment.