* performance issues
Signed-off-by: Nyhmo <yihua.mo@zilliz.com>

* fix bugs
Signed-off-by: Nyhmo <yihua.mo@zilliz.com>

* preload collection issue
Signed-off-by: Nyhmo <yihua.mo@zilliz.com>

* uncomment boring log
Signed-off-by: Nyhmo <yihua.mo@zilliz.com>

* reduce unittest time
Signed-off-by: Nyhmo <yihua.mo@zilliz.com>

* reduce metric test time cost
Signed-off-by: Nyhmo <yihua.mo@zilliz.com>