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Ensure APM Server makes full usage of available CPU resources #9182

@simitt

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@simitt

Previous benchmarks indicate that the APM Server performs better when scaling horizontally than vertically. This is a meta issue collecting steps necessary to ensure APM Server's throughput scales well when scaling the server's available CPU resources up.

Previous investigations identified the modelindexer to be a bottle neck, and two action items were identified:

The improvements need to be benchmarked; the goal is to provide full resource usage and (almost) linear scaling for APM Server's up to 32GB of RAM (with aliquot CPU time) on ESS.

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