Change autogenerated protobuf code.

config/generated/config.pb.go

@@ -2,15 +2,27 @@
 // source: config.proto
 // DO NOT EDIT!
 
+/*
+Package io_prometheus is a generated protocol buffer package.
+
+It is generated from these files:
+	config.proto
+
+It has these top-level messages:
+	LabelPair
+	LabelPairs
+	GlobalConfig
+	TargetGroup
+	JobConfig
+	PrometheusConfig
+*/
 package io_prometheus
 
 import proto "code.google.com/p/goprotobuf/proto"
-import json "encoding/json"
 import math "math"
 
-// Reference proto, json, and math imports to suppress error if they are not otherwise used.
+// Reference imports to suppress errors if they are not otherwise used.
 var _ = proto.Marshal
-var _ = &json.SyntaxError{}
 var _ = math.Inf
 
 // A label/value pair suitable for attaching to timeseries.