InspectIT

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InspectIT is an open-source tool for monitoring and diagnosing Java applications. It is developed by NovaTec Consulting GmbH in Stuttgart, Germany, and became open-source in August 2015 under the Apache License 2.0.

How it works
- User-transaction-centered: for every user request, it builds an invocation sequence (a detailed call tree) showing how long each instrumented method runs, including database calls.
- Real User Monitoring: since version 1.8.1, it can record real user interactions with websites or web apps.
- Low overhead: a Java agent is loaded at JVM startup and instruments code at selected points, so you don’t have to change the source code.

Key facts
- Open-source, cross-platform, written in Java; code hosted on GitHub.
- Origin: started in 2005 as NovaSpy (closed source), renamed inspectIT in 2008, first major release in 2010, open-sourced in 2015.
- Stable releases have been in the 1.7.x line, with a 1.8.x preview released in 2017.