Added unit annotation supports onto tsmon in go.

common/tsmon/runtimestats/runtimestats.go

Index: common/tsmon/runtimestats/runtimestats.go
diff --git a/common/tsmon/runtimestats/runtimestats.go b/common/tsmon/runtimestats/runtimestats.go
index a9b76203badf584aab4f0f7461c67949d4f160be..59e0acbb2ac2d8411edf1f979f19af8ab7d48cb9 100644
--- a/common/tsmon/runtimestats/runtimestats.go
+++ b/common/tsmon/runtimestats/runtimestats.go
@@ -17,33 +17,34 @@ import (
 	"golang.org/x/net/context"
 
 	"github.com/luci/luci-go/common/tsmon/metric"
+	"github.com/luci/luci-go/common/tsmon/types"
 )
 
 var (
 	// Some per-process memory allocator stats.
 	// See https://golang.org/pkg/runtime/#MemStats
 
-	MemAlloc       = metric.NewInt("go/mem/alloc", "Bytes allocated and not yet freed.")
-	MemTotalAlloc  = metric.NewCounter("go/mem/total_alloc", "Bytes allocated (even if freed).")
-	MemMallocs     = metric.NewCounter("go/mem/mallocs", "Number of mallocs.")
-	MemFrees       = metric.NewCounter("go/mem/frees", "Number of frees.")
-	MemNextGC      = metric.NewInt("go/mem/next_gc", "Next GC will happen when go/mem/alloc > this amount.")
-	MemNumGC       = metric.NewCounter("go/mem/num_gc", "Number of garbage collections.")
-	MemPauseTotal  = metric.NewCounter("go/mem/pause_total", "Total GC pause, in microseconds.")
-	MemHeapSys     = metric.NewInt("go/mem/heap_sys", "Bytes obtained from system.")
-	MemHeapIdle    = metric.NewInt("go/mem/heap_idle", "Bytes in idle spans.")
-	MemHeapInuse   = metric.NewInt("go/mem/heap_in_use", "Bytes in non-idle span.")
-	MemHeapObjects = metric.NewCounter("go/mem/heap_objects", "total number of allocated objects.")
-	MemStackInuse  = metric.NewInt("go/mem/stack_in_use", "Bytes used by stack allocator.")
-	MemStackSys    = metric.NewInt("go/mem/stack_in_sys", "Bytes allocated to stack allocator.")
-	MemMSpanInuse  = metric.NewInt("go/mem/mspan_in_use", "Bytes used by mspan structures.")
-	MemMSpanSys    = metric.NewInt("go/mem/mspan_in_sys", "Bytes allocated to mspan structures.")
-	MemMCacheInuse = metric.NewInt("go/mem/mcache_in_use", "Bytes used by mcache structures.")
-	MemMCacheSys   = metric.NewInt("go/mem/mcache_in_sys", "Bytes allocated to mcache structures.")
+	MemAlloc       = metric.NewInt("go/mem/alloc", "Bytes allocated and not yet freed.", types.MetricMetadata{types.Bytes})
+	MemTotalAlloc  = metric.NewCounter("go/mem/total_alloc", "Bytes allocated (even if freed).", types.MetricMetadata{types.Bytes})
+	MemMallocs     = metric.NewCounter("go/mem/mallocs", "Number of mallocs.", types.MetricMetadata{})
+	MemFrees       = metric.NewCounter("go/mem/frees", "Number of frees.", types.MetricMetadata{})
+	MemNextGC      = metric.NewInt("go/mem/next_gc", "Next GC will happen when go/mem/alloc > this amount.", types.MetricMetadata{})
+	MemNumGC       = metric.NewCounter("go/mem/num_gc", "Number of garbage collections.", types.MetricMetadata{})
+	MemPauseTotal  = metric.NewCounter("go/mem/pause_total", "Total GC pause, in microseconds.", types.MetricMetadata{})
+	MemHeapSys     = metric.NewInt("go/mem/heap_sys", "Bytes obtained from system.", types.MetricMetadata{types.Bytes})
+	MemHeapIdle    = metric.NewInt("go/mem/heap_idle", "Bytes in idle spans.", types.MetricMetadata{types.Bytes})
+	MemHeapInuse   = metric.NewInt("go/mem/heap_in_use", "Bytes in non-idle span.", types.MetricMetadata{types.Bytes})
+	MemHeapObjects = metric.NewCounter("go/mem/heap_objects", "total number of allocated objects.", types.MetricMetadata{})
+	MemStackInuse  = metric.NewInt("go/mem/stack_in_use", "Bytes used by stack allocator.", types.MetricMetadata{types.Bytes})
+	MemStackSys    = metric.NewInt("go/mem/stack_in_sys", "Bytes allocated to stack allocator.", types.MetricMetadata{types.Bytes})
+	MemMSpanInuse  = metric.NewInt("go/mem/mspan_in_use", "Bytes used by mspan structures.", types.MetricMetadata{types.Bytes})
+	MemMSpanSys    = metric.NewInt("go/mem/mspan_in_sys", "Bytes allocated to mspan structures.", types.MetricMetadata{types.Bytes})
+	MemMCacheInuse = metric.NewInt("go/mem/mcache_in_use", "Bytes used by mcache structures.", types.MetricMetadata{types.Bytes})
+	MemMCacheSys   = metric.NewInt("go/mem/mcache_in_sys", "Bytes allocated to mcache structures.", types.MetricMetadata{types.Bytes})
 
 	// Other runtime stats.
 
-	GoroutineNum = metric.NewInt("go/goroutine/num", "The number of goroutines that currently exist.")
+	GoroutineNum = metric.NewInt("go/goroutine/num", "The number of goroutines that currently exist.", types.MetricMetadata{})
 )
 
 // Report updates runtime stats metrics.