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Hi.
1 What If my instance accidentally runs constantly at 100% of CPU utilisation ?
Keep the vCPU average below the baseline during normal times.
If you cross the baseline, you will consume burst credits.
And Lightsail instances that are depleted of burst credits will slow down to baseline. It can be used 24 hours a day, 7 days a week, but it cannot handle high-load conditions because there is an upper limit on the CPU usage rate.
Rodney mentions additional payments, but I think this is the case for EC2.
With EC2, you can choose between slowing down to baseline when you run out of burst credits, or paying an extra fee to keep bursting.
In the case of Lightsail, there is no unlimited function when using EC2 burst credit, so CPU usage is limited to the baseline.
You will find the following article helpful.
https://lightsail.aws.amazon.com/ls/docs/en_us/articles/amazon-lightsail-viewing-instance-burst-capacity
2 How other instances bursts can negatively affect my instance ?
As mentioned above, you are calculated and limited by the average vCPU assigned to you on the virtual machine. Therefore, there is no need to consider the adverse effects of other users.
You will end up paying for the additional capacity. See https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/burstable-credits-baseline-concepts.html
You can monitor the burst capacity by following the steps in this blog: https://aws.amazon.com/blogs/compute/proactively-monitoring-system-performance-on-amazon-lightsail-instances/
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