Added unit annotation supports onto tsmon in go.

common/tsmon/store/inmemory.go

Index: common/tsmon/store/inmemory.go
diff --git a/common/tsmon/store/inmemory.go b/common/tsmon/store/inmemory.go
index b4fce1e4ecd9cda3c22825fdbc3eb3a50c2e55b7..eee44d4d717a49b9d2ab120816e989a24da17560 100644
--- a/common/tsmon/store/inmemory.go
+++ b/common/tsmon/store/inmemory.go
@@ -32,6 +32,7 @@ type cellKey struct {
 
 type metricData struct {
 	types.MetricInfo
+	types.MetricMetadata
 
 	cells map[cellKey][]*types.CellData
 	lock  sync.Mutex
@@ -250,7 +251,7 @@ func (s *inMemoryStore) GetAll(ctx context.Context) []types.Cell {
 				if cellCopy.Target == nil {
 					cellCopy.Target = defaultTarget
 				}
-				ret = append(ret, types.Cell{m.MetricInfo, cellCopy})
+				ret = append(ret, types.Cell{m.MetricInfo, m.MetricMetadata, cellCopy})
 			}
 		}
 		m.lock.Unlock()