implement optional soft allocation ceiling | #139
use more efficient wire serialization | #141
send excess traces when reducing cache size | #142
add mutex locking to fileConfig | #143
only re-route incoming spans | #145
don't block batch endpoint on most queues | #146
add cache utilization and root span metrics | #150
peers list should not be required in config | #148
consolidate event handling code | #149
Rules Base Sampler | #151