This ticket also includes the investigation of relevant metrics/logging that can be introduced to increase visibility into the oplog sampling process and identifying any new ones to be added once we have made sampling async. Some ideas include:

• The progress with the number of truncation markers created during sampling.
• The state of the sampling thread at regular intervals (e.g., active, idle).
• The oplog growth rate throughout the sampling period.
• How much time has elapsed between startup finishing and sampling finishing.

This ticket can be further subdivided into other tickets as needed.