Load testing overview
### Problem to Solve
Create a first pass load test for the GKG querying environment in staging to determine current load requirements.
### Pre-reqs
1. Clone https://gitlab.com/gitlab-org/orbit/load-testing and follow the instructions.
2. At least some basic observability set up for GKG read components and Clickhouse in staging. See https://gitlab.com/gitlab-com/gl-infra/observability/team/-/work_items/4520 and https://gitlab.com/gitlab-org/orbit/knowledge-graph/-/work_items/215
### Observability links for staging:
- [Staging API overview dashboard](https://dashboards.gitlab.net/d/api-main/api3a-overview?orgId=1&from=now-3h&to=now&timezone=utc&var-PROMETHEUS_DS=mimir-gitlab-gstg&var-environment=gstg&var-stage=main)
- [Rails endpoints filtered to orbit](https://dashboards.gitlab.net/goto/dfgij40aqonpce?orgId=1)
- [Staging resource saturation](https://dashboards.gitlab.net/d/api-main/api3a-overview?orgId=1&from=now-1h&to=now&timezone=utc&var-PROMETHEUS_DS=mimir-gitlab-gstg&var-environment=gstg&var-stage=main&viewPanel=panel-1217942947)
- [Clickhouse staging environment](https://dashboards.gitlab.net/goto/cfgij5aezi77kb?orgId=1)
- [Workhorse logs in staging](https://nonprod-log.gitlab.net/app/r/s/5m4dg)
issue