When we set out to create a cloud-based tool for configuration monitoring, we used the tools we knew and wrote UpGuard using JRuby. For our application, JRuby had many good qualities: getting started only required a one line install, the agent only needed to talk out on port 443, and it was platform agnostic. Using JRuby we demonstrated the value of system visibility, attracted our first cohort of customers, and raised the funds to expand UpGuard. Now we're not only scrapping that agent, we're moving away from agent-based architecture altogether. Here's why.