Broken windows: Why the ‘Single Pane of Glass’ is Impossible

The concept of a "Single Pane of Glass" (SPOG) in Application Performance Monitoring (APM) is often touted as a solution for monitoring complex software systems, but it is ultimately misguided due to its limitations and contradictions. The pursuit of SPOG fails to address the complexities of modern software systems and the diverse needs of those who monitor them. Instead of aggregating data from every system into a single view, relevant and actionable insights should be presented in a manner that is immediately useful to its audience. Synthetic monitoring, which tests a service with automated browsers and simulates user interactions, can connect all the systems involved in handling real users' requests and reveal if users can actually log in and perform actions. By improving understanding through knowledge sharing, prioritizing data generated by synthetic user tests, standardizing event formatting, and creating SRE runbooks, observability can be improved at almost no cost, breaking beyond the confines of a single dashboard.

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