NODE-3869 Description

• case: 00872705
• cluster: prod-mongo-01
• Node mongodb driver version : 4.3.0
• Node version : v12.22.4
• issue presented: 2:00 AM Eastern Time on 1/13/2022, until restoration at 10:30 AM Eastern Time.
• App Error " ++++++Error: querySrv ESERVFAIL _mongodb._tcp.prod-mongo-01.jggcf.azure.mongodb.net "
• Shell error: Error: querySrv ESERVFAIL _mongodb._tcp.prod-mongo-01-pri.jggcf.azure.mongodb.net "

• User has shared the below concern:

  This is a critical issue affecting our business operations, since some of the application servers lost connectivity to the MongoDB instance and couldn't reconnect. We've employed a work around by changing the connection string and restored service.

  We would like to understand the cause of the issue which started occurring at approximately 2:00 AM Eastern Time on 1/13/2022, until restoration at 10:30 AM Eastern Time. We also want to understand how to address this with a long-term fix.

Action requested: This user is using latest driver per compatibility documentation