Revert "Not to flush out batched report in destructor (#1790)" (#1793)
Revert "Not to flush out batched report in destructor (#1790)" (#1793)

This reverts commit e9cdb205862ca1fcf54b208ea73232bbfc23f919.
istio/proxy,lizan/proxy,lizan/proxy,lizan/proxy,istio/proxy,lizan/proxy,istio/proxy,istio/proxy