This document discusses the evolution of DevOps tools at AppsFlyer and provides examples. It notes that AppsFlyer processes around 4.9 billion events per day across 120 services running on elastic infrastructure with dozens of daily deployments and a team of 25 developers. The one team philosophy motivates building internal tools to meet operational needs, extend existing tools, learn new technologies, and improve collaboration between development and operations. Considerations for new tools include needs, usability, audience, maintenance, and time constraints. Examples given are a mapping tool called Sniffer, aggregated monitoring reports from Sensu, and an authentication system called Bouncer.