Update the utilisation guidance to avoid overutilisation

[regularfry]

The Kingman formula tells you what happens when a resource has 100% utilisation, and it's not good:

Any system that has a latency constraint wants to be very careful about approaching 100% utilisation. I've reworded the advice here from aiming at 100% to aiming at 80%, which is a fairly safe amount of headroom.

This obviously doesn't apply to elastic on-demand infrastructure except where we are controlling autoscaling parameters.

[sonarqubecloud[bot]]

Quality Gate passed

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[sonarqubecloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
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0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud