Changes in version 3.7 - 16 Aug 2020. ------------------------------- The font used by RRD4J can now be defined a set of properties. See the introduction of the class RrdGraphConstants for more details. Improving URI normalization used internally by the pool, to ensure that same RRD opened using different path are indeed resolved as the same. Added a RrdDbPool.lockEmpty method to wait for an empty pool and lock it. The RrdDb.Builder.setPool now automatically enable the pool usage. Plottable usages are all replaced by an IPlottable interface, so lambda can be used instead. This class is now marked as deprecated.