Milo: Show accurate pending build numbers for builder view.

milo/api/resp/builder.go

 // Copyright 2015 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.
 
 //go:generate stringer -type=BotStatus
 
 package resp
 
 import (
         "time"
@@ skipping 43 matching lines @@
 }
 
 // Builder denotes an ordered list of MiloBuilds
 type Builder struct {
         // Name of the builder
         Name string
 
         // Warning text, if any.
         Warning string
 
-        CurrentBuilds  []*BuildSummary
-        PendingBuilds  []*BuildSummary
-        FinishedBuilds []*BuildSummary
+        CurrentBuilds []*BuildSummary
+        PendingBuilds []*BuildSummary
+        // PendingBuildNum is the number of pending builds, since the slice above
+        // may be a snapshot instead of the full set.
+        PendingBuildNum int
+        FinishedBuilds  []*BuildSummary
 
         // MachinePool is primarily used by buildbot builders to list the set of
         // machines that can run in a builder.  It has no meaning in buildbucket or dm
         // and is expected to be nil.
         MachinePool *MachinePool
 
         // PrevCursor is a cursor to the previous page.
         PrevCursor string `json:",omitempty"`
         // NextCursor is a cursor to the next page.
         NextCursor string `json:",omitempty"`
@@ skipping 15 matching lines @@
 }
 
 // MachinePool represents the capacity and availability of a builder.
 type MachinePool struct {
         Total        int
         Disconnected int
         Idle         int
         Busy         int
         Bots         []Bot
 }