In his blog Markus Eisele writes;
Censum is the analysis tool that tells you in plain English what your Garbage Collection (GC) performance problem is and how to fix it. Instead of having to read the GC log entries produced by -verbose:gc -XX:+PrintTenuringDistribution -XX:+PrintGCDetails which is very condensed and hard to interpret
Censum was just recently released by jClarity, a new startup focused on building smarter performance monitoring and diagnostic tooling. Markus provides a brief description of how the tooling works and ends with "A great new way for garbage collection optimization".