Provide access to RubyProf via a monitoring/health endpoint
Go LabKit now supports a monitoring endpoint.
This endpoint supports /metrics and /debug endpoints. The metrics endpoint is used for prometheus monitoring, the /debug endpoints provides access to Go's profiling and internal debugging tools (see https://jvns.ca/blog/2017/09/24/profiling-go-with-pprof/)
In https://gitlab.com/gitlab-com/gl-infra/infrastructure/issues/8528 one of the big problems we had was understanding why the application was locked up. Being able to profile the application and quickly assess that all database calls were blocking until timeout would have been a huge advantage.
Had the problem been in Go, we would have been able to do this, using the functionality we expose via /debug/pprof. It would be great if LabKit Ruby provided the same functionality.