Migration loadtest from 4.89.0 > 4.90.0 is causing extremely high Server & DB CPU load

[AndreyKizimenko]

Fleet versions

• Discovered: 4.90
• Reproduced: 4.90

Web browser and operating system:

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💥  Actual behavior

Fleet Server CPU avg = 96.62
RDS Writer CPU avg = 89.75
RDS Writer Threads Running (vCPUs=16) = 31.78 (expected < 16)

🛠️ Expected behavior

TODO

🧑‍💻  Steps to reproduce

These steps:

• Have been confirmed to consistently lead to reproduction in multiple Fleet instances.
• Describe the workflow that led to the error, but have not yet been reproduced in multiple Fleet instances.

1. Spin up a loadtest environment with 100k hosts and 150k hosts infra on a 4.89.0 branch
2. Migrate to 4.90.0
3. Track DB and Server CPU load

🕯️ More info (optional)

N/A