SLO Workbench is a pair of interactive observability playgrounds for DevOps and site reliability engineers. The first playground simulates error rates and error-budget burn, letting you tune an SLO target, inject incidents, and watch multi-window burn-rate alerts fire on fast bursts versus sustained failures. The second playground challenges you to define an SLI (indicator) and an SLO (objective) for a virtual HTTP microservice using preset metrics such as latency and status codes (200, 404, 429, 500, 503), then grades how correctly you configured them — including metric choice, status classification, latency thresholds, and SLO target realism — against a reference SRE configuration.