Use Case

As a Node.js driver engineer
I want Monitor to advertise the "minRoundTripTime" across a rolling set of RTTs
So that I can confidently calculate an accurate maxTimeMS setting or short circuit an operation when CSOT is enabled.

See DRIVERS-2035

User Impact

• No API changes as affected classes are internal
• May see more stable server selection

Dependencies

• None

Unknowns

• None

Acceptance Criteria

Implementation Requirements

• Add a "minRoundTripTime" to the Monitor and RTTPinger classes
• Clients MUST report the minimum RTT as 0 until at least 2 samples have been
• Clients MUST track the minimum RTT out of the (at most) last 10 samples.
• Update "roundTripTime" to be the average across the current sample set
• Make minRoundTripTime accessible to Connection class

Testing Requirements

• Note that the maxTimeMS calculation for CSOT that uses minRTT are the only spec tests and will be enabled in a future ticket
• Bespoke node unit testing, using sinon or manually created socket server
  • Simulate RTT values, ensure average is calculated correctly and minimum is reported accurately

Documentation Requirements

• Add TSDoc to server description fields

Follow Up Requirements

• None