Maintenance for fprdata-app instance (i-08dde9bb1f8effd6)

Hi everyone,
We've got a notification from AWS that there's a scheduled maintenance (2018-08-24 12:00:00 UTC) for one of our 3 fprdata-app instances : i-08dde9bb1f8effd62 , 172.20.255.7.
See https://29022131.atlassian.net/browse/TOSD-4043 for more details.
In order to prevent the maintenance from disrupting our production system, I'm going to stop-start the instance before the given schedule.

What are the actionables?

Penta (on-call) to set the following instance 172.20.255.7 as unhealthy
Penta to monitor until no traffic is served by 172.20.255.7
Chandra to stop and start the instance
Penta to redeploy to 172.20.255.7 with the same binary version as the one before maintenance
Penta to help monitor until traffic is confirmed to be served and no anomalies are detected after maintenance

What will be the risk of this operation?
Increased load for the other 2 fprdata-app instances. However, based on this metric (https://app.datadoghq.com/dash/401195/fpr-fprdata-app---system?live=true&page=0&is_auto=false&from_ts=1534743192143&to_ts=1534746792143&tile_size=m&fullscreen=307109700) the CPU utilization for all fprdata-app instances is below 10%. Having 2 active fprdata-app instances should not be a problem, therefore this operation is low risk.

When should we do it?
As this week is a 4-day-only week, I'm planning to do the maintenance tonight, 19:30. However, please let me know if you have some concerns/comments.