Imports
- github.com/prometheus/client_golang/prometheus
- github.com/pingcap/kvproto/pkg/metapb
- github.com/pingcap/kvproto/pkg/pdpb
- github.com/sirupsen/logrus
- github.com/juju/errors
- github.com/pingcap/pd/server/core
- github.com/pingcap/pd/server/cache
- github.com/pingcap/pd/server/namespace