Applications used to be so simple, some self-contained code linked with a few system libraries that accessed local data: a distinct bundle where everything required was on a single machine. Client-server software complicated things a bit, but the demarcation was clean and the hub-spoke design pattern straightforward. No longer. Apps are now composite mashups, often mixing custom and packaged code, accessing both public and private data sources and using APIs to access multiple Web services that each run on highly distributed cloud infrastructure. Gone are the boundaries between an application, associated infrastructure and data. Of course, this fusion of apps and infrastructure is transparent and irrelevant to users, but to developers, release managers, business owners and IT it’s a nightmare of complexity that makes monitoring, troubleshooting and maintaining application performance frustratingly difficult. Indeed, the situation requires a new approach that mixes traditional application performance monitoring (APM) and IT operational intelligence (OI).

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