Memory leak for java SDK

[mrrtree]

Describe this problem

Memory leak for sdk 1.0.0

Steps to reproduce

Expected behavior

Additional Information

[mrrtree]

[mrrtree]

50% memory used for MetricRegistry, and most keys are like req_rt_MethodDescriptor{fullMethodName=storage.StorageService/Write, type=UNARY, idempotent=false, safe=false, sampledToLocalTracing=false, requestMarshaller=io.grpc.protobuf.lite.ProtoLiteUtils$MessageMarshaller@545c29f8, responseMarshaller=io.grpc.protobuf.lite.ProtoLiteUtils$MessageMarshaller@5022412}