reuse report protobuf instead of using arena allocation (#1989)
reuse report protobuf instead of using arena allocation (#1989)

Signed-off-by: Wayne Zhang <bc786b8a4d6362cffdb954a38777b93c3461fd92@google.com>
istio/proxy,istio/proxy,lizan/proxy,istio/proxy,istio/proxy,lizan/proxy,lizan/proxy,lizan/proxy