Added unit annotation supports onto tsmon in go.

server/internal/logdog/collector/coordinator/cache.go

 // Copyright 2016 The LUCI Authors. All rights reserved.
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
 package coordinator
 
 import (
         "sync"
         "time"
 
         "github.com/luci/luci-go/common/clock"
         "github.com/luci/luci-go/common/config"
         "github.com/luci/luci-go/common/errors"
         "github.com/luci/luci-go/common/logdog/types"
         log "github.com/luci/luci-go/common/logging"
         "github.com/luci/luci-go/common/lru"
         "github.com/luci/luci-go/common/promise"
         "github.com/luci/luci-go/common/tsmon/field"
         "github.com/luci/luci-go/common/tsmon/metric"
+        tsmon_types "github.com/luci/luci-go/common/tsmon/types"
         "golang.org/x/net/context"
 )
 
 const (
         // DefaultSize is the default (maximum) size of the LRU cache.
         DefaultSize = 1024 * 1024
 
         // DefaultExpiration is the default expiration value.
         DefaultExpiration = 10 * time.Minute
 )
 
 var (
         tsCache = metric.NewCounter("logdog/collector/coordinator/cache",
                 "Metrics for cache uses, tracking hits and misses.",
+                tsmon_types.MetricMetadata{},
                 field.Bool("hit"))
 )
 
 // cache is a Coordinator interface implementation for the Collector service
 // that caches remote results locally.
 type cache struct {
         Coordinator
 
         // Size is the number of stream states to hold in the cache.
         size int
@@ skipping 250 matching lines @@
                         ce.terminalIndex = tidx
                 }
         })
 }
 
 func (ce *cacheEntry) withLock(f func()) {
         ce.Lock()
         defer ce.Unlock()
         f()
 }