diff --git a/go/chromiumos/bot_scaling.pb.go b/go/chromiumos/bot_scaling.pb.go
index 732d972..83edba9 100644
--- a/go/chromiumos/bot_scaling.pb.go
+++ b/go/chromiumos/bot_scaling.pb.go
@@ -193,10 +193,12 @@
 	// A set of dimensions used to validate current Swarming allocations.
 	SwarmingDimensions []*SwarmingDimension `protobuf:"bytes,5,rep,name=swarming_dimensions,json=swarmingDimensions,proto3" json:"swarming_dimensions,omitempty"`
 	// Set whether a bot group should be configured or only monitored.
-	PolicyMode           BotPolicy_Mode `protobuf:"varint,6,opt,name=policy_mode,json=policyMode,proto3,enum=chromiumos.BotPolicy_Mode" json:"policy_mode,omitempty"`
-	XXX_NoUnkeyedLiteral struct{}       `json:"-"`
-	XXX_unrecognized     []byte         `json:"-"`
-	XXX_sizecache        int32          `json:"-"`
+	PolicyMode BotPolicy_Mode `protobuf:"varint,6,opt,name=policy_mode,json=policyMode,proto3,enum=chromiumos.BotPolicy_Mode" json:"policy_mode,omitempty"`
+	// Number of hours to lookback for Swarming stats.
+	LookbackHours        int32    `protobuf:"zigzag32,7,opt,name=lookback_hours,json=lookbackHours,proto3" json:"lookback_hours,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
 }
 
 func (m *BotPolicy) Reset()         { *m = BotPolicy{} }
@@ -266,6 +268,13 @@
 	return BotPolicy_UNKNOWN_MODE
 }
 
+func (m *BotPolicy) GetLookbackHours() int32 {
+	if m != nil {
+		return m.LookbackHours
+	}
+	return 0
+}
+
 // Scaling restriction specifies the limits on how the group can be
 // expanded or reduced.
 type BotPolicy_ScalingRestriction struct {
@@ -642,51 +651,53 @@
 func init() { proto.RegisterFile("chromiumos/bot_scaling.proto", fileDescriptor_dbe70eabfd64e7ef) }
 
 var fileDescriptor_dbe70eabfd64e7ef = []byte{
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 }
diff --git a/src/chromiumos/bot_scaling.proto b/src/chromiumos/bot_scaling.proto
index 848d264..99a340f 100644
--- a/src/chromiumos/bot_scaling.proto
+++ b/src/chromiumos/bot_scaling.proto
@@ -76,6 +76,8 @@
 
   // Set whether a bot group should be configured or only monitored.
   Mode policy_mode = 6;
+  // Number of hours to lookback for Swarming stats.
+  sint32 lookback_hours = 7;
 }
 
 // Configures the root message.