This document discusses the leakcanary tool, an open source memory leak detection library for Android. It passively monitors for memory leaks by wrapping watched objects in weak references and checking for garbage collection. If a leak is found, it dumps the heap and sends a notification. The detection flow involves watching objects, checking for garbage collection, dumping the heap if needed, and parsing the dump. It can exclude known SDK leaks and has been used to find leaks in activities and other objects.