Proposal: Load testing with k6 (litmuschaos#4309)

* proposal: load testing with k6

Signed-off-by: namkyu1999 <lak9348@konkuk.ac.kr>

proposals/k6-load-test.md

@@ -0,0 +1,78 @@
+| title                                           | authors                                      | creation-date | last-updated |
+| ----------------------------------------------- | -------------------------------------------- | ------------- | ------------ |
+| Adding a New Chaos Fault - Load Testing with k6 | [@namkyu1999](https://github.com/namkyu1999) | 2023-11-23    | 2023-11-23   |
+
+# Adding a New Chaos Fault - Load Testing with k6
+
+- [Summary](#summary)
+- [Motivation](#motivation)
+  - [Goals](#goals)
+  - [Non-Goals](#non-goals)
+- [Proposal](#proposal)
+  - [Use Cases](#use-cases)
+  - [Implementation Details](#implementation-details)
+- [Risks and Mitigations](#risks-and-mitigations)
+- [Upgrade / Downgrade Strategy](#upgrade--downgrade-strategy)
+- [Drawbacks](#drawbacks)
+- [Alternatives](#alternatives)
+- [References](#references)
+
+## Summary
+
+[k6](https://k6.io/) is an open-source load testing tool managed by [Grafana Labs](https://grafana.com/). It supports various types of load tests, is easy to use(simply write js script), and is fully open-source. So I want to add a new chaos fault(k6 load test) to Litmus ChaosHub.
+
+## Motivation
+
+Litmus ChaosHub has plenty of Chaos Faults. And we already have [Pod I/O stress](https://litmuschaos.github.io/litmus/experiments/categories/pods/pod-io-stress/) and [Node I/O stress](https://litmuschaos.github.io/litmus/experiments/categories/nodes/node-io-stress/). But These do not cover all of Load testing. k6 supports many types of load testing such as smoke testing and stress testing. You can check all types in this [url](https://k6.io/docs/test-types/load-test-types/). Plus, this open-source is already mature, with 22k GitHub stars and a strong community with robust use cases. Adding 'k6 load testing' Chaos Fault in ChaosHub can help create a more resilient system.
+
+### Goals
+
+- Adding a 'k6 load testing' Chaos Fault to [Litmus ChaosHub](https://hub.litmuschaos.io/)
+- Fixing [litmus-go](https://github.com/litmuschaos/litmus-go) and [chaos-charts](https://github.com/litmuschaos/chaos-charts) codes
+
+### Non-Goals
+
+- Fixing k6 codes is a non-goal
+- Using [k6 operator](https://github.com/grafana/k6-operator) is a non-goal
+- Fixing Litmus codes except for [litmus-go](https://github.com/litmuschaos/litmus-go) and [chaos-charts](https://github.com/litmuschaos/chaos-charts) is a non-goal
+
+## Proposal
+
+### Use Cases
+
+#### Use case 1
+
+In Chaos Studio, Users can select 'k6 load testing' Chaos Fault as part of the Chaos Experiment. They can compose it with other Chaos Faults.
+
+### Implementation Details
+
+Here's a Chaos Fault Scenario.
+
+![k6-fault-scenario](./images/k6-fault-scenario.png)
+
+#### Phase 1 - Add scenario to the litmus-go repository
+
+I will use `litmuschaos/go-runner` image. So I am going to add a new case in the litmus-go repository.
+
+#### Phase 2 - Add a new Chaos Fault to the Litmus ChaosHub
+
+After Phase 1 PR gets merged, I will raise a PR that adds a 'k6 load testing' Chaos Fault to the `chaos-charts` repository. When all is done, the user can easily use k6 in Chaos Studio.
+
+## Risks and Mitigations
+
+We need to grant proper RBAC permissions to the runner container. Granting override permissions may affect other systems.
+
+## Upgrade / Downgrade Strategy
+
+## Drawbacks
+
+## Alternatives
+
+As I mentioned earlier, we already have [Pod I/O stress](https://litmuschaos.github.io/litmus/experiments/categories/pods/pod-io-stress/) and [Node I/O stress](https://litmuschaos.github.io/litmus/experiments/categories/nodes/node-io-stress/). If we adopt k6, we can test not only in the pod, and node layer but also service, load-balancer, or any layer that has ip.
+
+[Locust](https://locust.io/) can be a alternative. it supports python script based load testing. I prefer k6 over locust because k6 supports more load testing types and has cloud-native open-source integrations like Prometheus and Grafana.
+
+## References
+
+- [k6](https://k6.io/)
+- [k6 GitHub](https://github.com/grafana/k6)