# Arrival and Service Rates

> The measured rates at which requests arrive and at which a server completes them, the inputs a queuing model needs.

Record: `lexicon:arrival-and-service-rates`
Kind: metric
Layer: [Performance Core](https://banes-lab.com/records/layer/performance-core.md)
Canonical: https://banes-lab.com/ontology/lexicon#lexicon-arrival-and-service-rates

Listed in [Lexicon terms](https://banes-lab.com/api/records/lexicon.md), after [Unbounded Runtime Growth](https://banes-lab.com/records/lexicon/unbounded-runtime-growth.md) and before [Bottleneck Awareness](https://banes-lab.com/records/lexicon/bottleneck-awareness.md).

## Category

- [Scalability / Performance / Optimization](https://banes-lab.com/records/lexicon-category/scalability-performance-optimization.md)

## Required by

- [Queuing Theory](https://banes-lab.com/records/architecture/queuing-theory.md)

## Linked from

- [Scalability / Performance / Optimization](https://banes-lab.com/ontology/principles/architecture-category-scalability-performance-optimization.md)