diff --git a/go/chromiumos/bot_scaling.pb.go b/go/chromiumos/bot_scaling.pb.go
index b902d5b..6a5c58c 100644
--- a/go/chromiumos/bot_scaling.pb.go
+++ b/go/chromiumos/bot_scaling.pb.go
@@ -51,6 +51,38 @@
 	return fileDescriptor_dbe70eabfd64e7ef, []int{2, 0}
 }
 
+// Specifies mode for a bot scaling
+type BotPolicy_BotScalingMode int32
+
+const (
+	BotPolicy_UNKNOWN_SCALING_MODE BotPolicy_BotScalingMode = 0
+	// Scale up or down bots by the step size associated with bot group..
+	BotPolicy_STEPPED BotPolicy_BotScalingMode = 1
+	// Scale up or down bots by the demand on the bot group.
+	// For use on smaller bot groups that are susceptible to smaller increases.
+	BotPolicy_DEMAND BotPolicy_BotScalingMode = 2
+)
+
+var BotPolicy_BotScalingMode_name = map[int32]string{
+	0: "UNKNOWN_SCALING_MODE",
+	1: "STEPPED",
+	2: "DEMAND",
+}
+
+var BotPolicy_BotScalingMode_value = map[string]int32{
+	"UNKNOWN_SCALING_MODE": 0,
+	"STEPPED":              1,
+	"DEMAND":               2,
+}
+
+func (x BotPolicy_BotScalingMode) String() string {
+	return proto.EnumName(BotPolicy_BotScalingMode_name, int32(x))
+}
+
+func (BotPolicy_BotScalingMode) EnumDescriptor() ([]byte, []int) {
+	return fileDescriptor_dbe70eabfd64e7ef, []int{2, 1}
+}
+
 // Specifies if there has been a change since the last iteration.
 type ScalingAction_Actionable int32
 
@@ -204,10 +236,12 @@
 	// 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"`
 	// 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:"-"`
+	LookbackHours int32 `protobuf:"zigzag32,7,opt,name=lookback_hours,json=lookbackHours,proto3" json:"lookback_hours,omitempty"`
+	// Set the scaling approach for the bot group being monitored.
+	ScalingMode          BotPolicy_BotScalingMode `protobuf:"varint,8,opt,name=scaling_mode,json=scalingMode,proto3,enum=chromiumos.BotPolicy_BotScalingMode" json:"scaling_mode,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                 `json:"-"`
+	XXX_unrecognized     []byte                   `json:"-"`
+	XXX_sizecache        int32                    `json:"-"`
 }
 
 func (m *BotPolicy) Reset()         { *m = BotPolicy{} }
@@ -284,6 +318,13 @@
 	return 0
 }
 
+func (m *BotPolicy) GetScalingMode() BotPolicy_BotScalingMode {
+	if m != nil {
+		return m.ScalingMode
+	}
+	return BotPolicy_UNKNOWN_SCALING_MODE
+}
+
 // Scaling restriction specifies the limits on how the group can be
 // expanded or reduced.
 type BotPolicy_ScalingRestriction struct {
@@ -645,6 +686,7 @@
 
 func init() {
 	proto.RegisterEnum("chromiumos.BotPolicy_Mode", BotPolicy_Mode_name, BotPolicy_Mode_value)
+	proto.RegisterEnum("chromiumos.BotPolicy_BotScalingMode", BotPolicy_BotScalingMode_name, BotPolicy_BotScalingMode_value)
 	proto.RegisterEnum("chromiumos.ScalingAction_Actionable", ScalingAction_Actionable_name, ScalingAction_Actionable_value)
 	proto.RegisterType((*BotType)(nil), "chromiumos.BotType")
 	proto.RegisterType((*SwarmingDimension)(nil), "chromiumos.SwarmingDimension")
@@ -660,53 +702,57 @@
 func init() { proto.RegisterFile("chromiumos/bot_scaling.proto", fileDescriptor_dbe70eabfd64e7ef) }
 
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+	0x16, 0xb1, 0x01, 0x67, 0xb9, 0x2d, 0xac, 0x0f, 0x47, 0xc5, 0xa5, 0x17, 0xed, 0x1b, 0x21, 0xbc,
+	0x7e, 0xb6, 0x7d, 0xdc, 0x12, 0xeb, 0xa6, 0xe8, 0x7f, 0xf7, 0xdb, 0xb7, 0x31, 0x7b, 0x72, 0xef,
+	0x31, 0x1e, 0x9f, 0xad, 0xfd, 0xce, 0x68, 0x76, 0xcf, 0xc3, 0x33, 0xfd, 0x23, 0x3b, 0x8b, 0xd9,
+	0xda, 0x4b, 0x54, 0xd5, 0xe0, 0x37, 0xff, 0x05, 0x00, 0x00, 0xff, 0xff, 0xab, 0x89, 0xc3, 0x59,
+	0xfd, 0x06, 0x00, 0x00,
 }
diff --git a/src/chromiumos/bot_scaling.proto b/src/chromiumos/bot_scaling.proto
index d9f3b7e..f7593e9 100644
--- a/src/chromiumos/bot_scaling.proto
+++ b/src/chromiumos/bot_scaling.proto
@@ -80,6 +80,19 @@
   Mode policy_mode = 6;
   // Number of hours to lookback for Swarming stats.
   sint32 lookback_hours = 7;
+
+  // Specifies mode for a bot scaling
+  enum BotScalingMode {
+    UNKNOWN_SCALING_MODE = 0;
+    // Scale up or down bots by the step size associated with bot group..
+    STEPPED = 1;
+    // Scale up or down bots by the demand on the bot group.
+    // For use on smaller bot groups that are susceptible to smaller increases.
+    DEMAND = 2;
+  }
+
+  // Set the scaling approach for the bot group being monitored.
+  BotScalingMode scaling_mode = 8;
 }
 
 // Configures the root message.