diff --git a/LICENSE b/LICENSE
index cbeb29fe65..b4f8761cf3 100644
--- a/LICENSE
+++ b/LICENSE
@@ -186,7 +186,7 @@
       same "printed page" as the copyright notice for easier
       identification within third-party archives.
 
-   Copyright 2012 Prometheus Team
+   Copyright 2013 Prometheus Team
 
    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
diff --git a/Makefile b/Makefile
index 6c3153e125..9dc694f154 100644
--- a/Makefile
+++ b/Makefile
@@ -1,10 +1,10 @@
-# Copyright 2012 Prometheus Team
+# Copyright 2013 Prometheus Team
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
-# 
+#
 # http://www.apache.org/licenses/LICENSE-2.0
-# 
+#
 # Unless required by applicable law or agreed to in writing, software
 # distributed under the License is distributed on an "AS IS" BASIS,
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
diff --git a/Makefile.TRAVIS b/Makefile.TRAVIS
index 4eae9649d2..0bd4113013 100644
--- a/Makefile.TRAVIS
+++ b/Makefile.TRAVIS
@@ -1,4 +1,4 @@
-# Copyright 2012 Prometheus Team
+# Copyright 2013 Prometheus Team
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
diff --git a/api/query.go b/api/query.go
index a13bfeb5e1..3041a0bfb8 100644
--- a/api/query.go
+++ b/api/query.go
@@ -7,6 +7,7 @@ import (
 	"github.com/prometheus/prometheus/rules"
 	"github.com/prometheus/prometheus/rules/ast"
 	"log"
+	"net/http"
 	"sort"
 	"time"
 )
@@ -74,14 +75,14 @@ func (serv MetricsService) Metrics() string {
 	rb.SetContentType(gorest.Application_Json)
 	if err != nil {
 		log.Printf("Error loading metric names: %v", err)
-		rb.SetResponseCode(500)
+		rb.SetResponseCode(http.StatusInternalServerError)
 		return err.Error()
 	}
 	sort.Strings(metricNames)
 	resultBytes, err := json.Marshal(metricNames)
 	if err != nil {
 		log.Printf("Error marshalling metric names: %v", err)
-		rb.SetResponseCode(500)
+		rb.SetResponseCode(http.StatusInternalServerError)
 		return err.Error()
 	}
 	return string(resultBytes)
diff --git a/coding/indexable/time.go b/coding/indexable/time.go
index 19080fa729..930e367ae9 100644
--- a/coding/indexable/time.go
+++ b/coding/indexable/time.go
@@ -1,10 +1,10 @@
-// Copyright 2012 Prometheus Team
+// Copyright 2013 Prometheus Team
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
-// 
+//
 // http://www.apache.org/licenses/LICENSE-2.0
-// 
+//
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
diff --git a/coding/indexable/time_test.go b/coding/indexable/time_test.go
index 6706540f3b..f24c0a07ad 100644
--- a/coding/indexable/time_test.go
+++ b/coding/indexable/time_test.go
@@ -1,4 +1,4 @@
-// Copyright 2012 Prometheus Team
+// Copyright 2013 Prometheus Team
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
diff --git a/coding/interface.go b/coding/interface.go
index fd1c7a790e..98441d68d7 100644
--- a/coding/interface.go
+++ b/coding/interface.go
@@ -1,4 +1,4 @@
-// Copyright 2012 Prometheus Team
+// Copyright 2013 Prometheus Team
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
diff --git a/coding/protocol_buffer.go b/coding/protocol_buffer.go
index 105c3c2eb5..8ad93424df 100644
--- a/coding/protocol_buffer.go
+++ b/coding/protocol_buffer.go
@@ -1,4 +1,4 @@
-// Copyright 2012 Prometheus Team
+// Copyright 2013 Prometheus Team
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
diff --git a/main.go b/main.go
index b5c7995dd3..38c019e99f 100644
--- a/main.go
+++ b/main.go
@@ -1,4 +1,4 @@
-// Copyright 2012 Prometheus Team
+// Copyright 2013 Prometheus Team
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
diff --git a/model/Makefile b/model/Makefile
index 471ef1e2d6..87d95d7546 100644
--- a/model/Makefile
+++ b/model/Makefile
@@ -1,4 +1,4 @@
-# Copyright 2012 Prometheus Team
+# Copyright 2013 Prometheus Team
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
diff --git a/model/data.proto b/model/data.proto
index 7a957ea4d7..c3ad6ab1dd 100644
--- a/model/data.proto
+++ b/model/data.proto
@@ -1,4 +1,4 @@
-// Copyright 2012 Prometheus Team
+// Copyright 2013 Prometheus Team
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
diff --git a/model/dto.go b/model/dto.go
index e9695cd13e..9860eadd97 100644
--- a/model/dto.go
+++ b/model/dto.go
@@ -1,4 +1,4 @@
-// Copyright 2012 Prometheus Team
+// Copyright 2013 Prometheus Team
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
diff --git a/model/metric.go b/model/metric.go
index 6a517a6a74..de7a7620fb 100644
--- a/model/metric.go
+++ b/model/metric.go
@@ -1,4 +1,4 @@
-// Copyright 2012 Prometheus Team
+// Copyright 2013 Prometheus Team
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
diff --git a/rules/load.go b/rules/load.go
index bf12fdde87..c4f94235c5 100644
--- a/rules/load.go
+++ b/rules/load.go
@@ -92,10 +92,10 @@ func LoadRulesFromString(rulesString string) ([]*Rule, error) {
 
 func LoadRulesFromFile(fileName string) ([]*Rule, error) {
 	rulesReader, err := os.Open(fileName)
-	defer rulesReader.Close()
 	if err != nil {
 		return []*Rule{}, err
 	}
+	defer rulesReader.Close()
 	return LoadRulesFromReader(rulesReader)
 }
 
diff --git a/storage/interface.go b/storage/interface.go
index 0c3c722cc4..2bc1b72d3d 100644
--- a/storage/interface.go
+++ b/storage/interface.go
@@ -1,4 +1,4 @@
-// Copyright 2012 Prometheus Team
+// Copyright 2013 Prometheus Team
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
diff --git a/storage/metric/interface.go b/storage/metric/interface.go
index bcb03b84fe..9748dedda5 100644
--- a/storage/metric/interface.go
+++ b/storage/metric/interface.go
@@ -1,4 +1,4 @@
-// Copyright 2012 Prometheus Team
+// Copyright 2013 Prometheus Team
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
diff --git a/storage/metric/leveldb/diagnostics.go b/storage/metric/leveldb/diagnostics.go
index de6a725289..1c8fa98d55 100644
--- a/storage/metric/leveldb/diagnostics.go
+++ b/storage/metric/leveldb/diagnostics.go
@@ -1,4 +1,4 @@
-// Copyright 2012 Prometheus Team
+// Copyright 2013 Prometheus Team
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
diff --git a/storage/metric/leveldb/instrumentation.go b/storage/metric/leveldb/instrumentation.go
index 2bfcb65865..cad5a140bd 100644
--- a/storage/metric/leveldb/instrumentation.go
+++ b/storage/metric/leveldb/instrumentation.go
@@ -1,4 +1,4 @@
-// Copyright 2012 Prometheus Team
+// Copyright 2013 Prometheus Team
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
diff --git a/storage/metric/leveldb/interface_test.go b/storage/metric/leveldb/interface_test.go
index bbd54a9235..002f77852a 100644
--- a/storage/metric/leveldb/interface_test.go
+++ b/storage/metric/leveldb/interface_test.go
@@ -1,4 +1,4 @@
-// Copyright 2012 Prometheus Team
+// Copyright 2013 Prometheus Team
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
diff --git a/storage/metric/leveldb/leveldb_test.go b/storage/metric/leveldb/leveldb_test.go
index d914ac28cd..faef77fb18 100644
--- a/storage/metric/leveldb/leveldb_test.go
+++ b/storage/metric/leveldb/leveldb_test.go
@@ -1,4 +1,4 @@
-// Copyright 2012 Prometheus Team
+// Copyright 2013 Prometheus Team
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
diff --git a/storage/metric/leveldb/lifecycle.go b/storage/metric/leveldb/lifecycle.go
index cbe8cd1e86..683a5a239c 100644
--- a/storage/metric/leveldb/lifecycle.go
+++ b/storage/metric/leveldb/lifecycle.go
@@ -1,4 +1,4 @@
-// Copyright 2012 Prometheus Team
+// Copyright 2013 Prometheus Team
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
diff --git a/storage/metric/leveldb/mutable.go b/storage/metric/leveldb/mutable.go
index ab927ed455..68409ba23d 100644
--- a/storage/metric/leveldb/mutable.go
+++ b/storage/metric/leveldb/mutable.go
@@ -1,4 +1,4 @@
-// Copyright 2012 Prometheus Team
+// Copyright 2013 Prometheus Team
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
diff --git a/storage/metric/leveldb/reading.go b/storage/metric/leveldb/reading.go
index cfef876bff..98cffe1bbc 100644
--- a/storage/metric/leveldb/reading.go
+++ b/storage/metric/leveldb/reading.go
@@ -1,4 +1,4 @@
-// Copyright 2012 Prometheus Team
+// Copyright 2013 Prometheus Team
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
@@ -15,7 +15,6 @@ package leveldb
 
 import (
 	"code.google.com/p/goprotobuf/proto"
-	"errors"
 	"github.com/prometheus/prometheus/coding"
 	"github.com/prometheus/prometheus/coding/indexable"
 	"github.com/prometheus/prometheus/model"
@@ -644,42 +643,34 @@ func (d *MetricKeyDecoder) DecodeValue(in interface{}) (out interface{}, err err
 	return
 }
 
-type AcceptAllFilter struct{}
+type MetricNamesFilter struct{}
 
-func (f *AcceptAllFilter) Filter(key, value interface{}) (filterResult storage.FilterResult) {
-	return storage.ACCEPT
+func (f *MetricNamesFilter) Filter(key, value interface{}) (filterResult storage.FilterResult) {
+	unmarshaled, ok := key.(*dto.LabelPair)
+	if ok && *unmarshaled.Name == "name" {
+		return storage.ACCEPT
+	}
+	return storage.SKIP
 }
 
 type CollectMetricNamesOp struct {
-	MetricNameMap map[string]bool
+	metricNames []string
 }
 
 func (op *CollectMetricNamesOp) Operate(key, value interface{}) (err *storage.OperatorError) {
-	unmarshaled, ok := key.(*dto.LabelPair)
-	if !ok {
-		return &storage.OperatorError{
-			error:       errors.New("Key is not of correct type"),
-			Continuable: true,
-		}
-	}
-	if *unmarshaled.Name == "name" {
-		op.MetricNameMap[*unmarshaled.Value] = true
-	}
+	unmarshaled := key.(*dto.LabelPair)
+	op.metricNames = append(op.metricNames, *unmarshaled.Value)
 	return
 }
 
 func (l *LevelDBMetricPersistence) GetAllMetricNames() (metricNames []string, err error) {
-	metricNamesOp := &CollectMetricNamesOp{
-		MetricNameMap: map[string]bool{},
-	}
+	metricNamesOp := &CollectMetricNamesOp{}
 
-	_, err = l.labelSetToFingerprints.ForEach(&MetricKeyDecoder{}, &AcceptAllFilter{}, metricNamesOp)
+	_, err = l.labelSetToFingerprints.ForEach(&MetricKeyDecoder{}, &MetricNamesFilter{}, metricNamesOp)
 	if err != nil {
 		return
 	}
 
-	for labelName := range metricNamesOp.MetricNameMap {
-		metricNames = append(metricNames, labelName)
-	}
+	metricNames = metricNamesOp.metricNames
 	return
 }
diff --git a/storage/metric/leveldb/regressions_test.go b/storage/metric/leveldb/regressions_test.go
index 94559bc46b..64c5e7735c 100644
--- a/storage/metric/leveldb/regressions_test.go
+++ b/storage/metric/leveldb/regressions_test.go
@@ -1,4 +1,4 @@
-// Copyright 2012 Prometheus Team
+// Copyright 2013 Prometheus Team
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
diff --git a/storage/metric/leveldb/rule_integration_test.go b/storage/metric/leveldb/rule_integration_test.go
index c7cf6b3ad6..3498bb52f5 100644
--- a/storage/metric/leveldb/rule_integration_test.go
+++ b/storage/metric/leveldb/rule_integration_test.go
@@ -1,4 +1,4 @@
-// Copyright 2012 Prometheus Team
+// Copyright 2013 Prometheus Team
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
diff --git a/storage/metric/leveldb/type.go b/storage/metric/leveldb/type.go
index e5c7be6f75..fb060e92ef 100644
--- a/storage/metric/leveldb/type.go
+++ b/storage/metric/leveldb/type.go
@@ -1,4 +1,4 @@
-// Copyright 2012 Prometheus Team
+// Copyright 2013 Prometheus Team
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
diff --git a/storage/raw/index/interface.go b/storage/raw/index/interface.go
index 7ffecd7f08..237aab85fe 100644
--- a/storage/raw/index/interface.go
+++ b/storage/raw/index/interface.go
@@ -1,4 +1,4 @@
-// Copyright 2012 Prometheus Team
+// Copyright 2013 Prometheus Team
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
diff --git a/storage/raw/index/leveldb/interface_test.go b/storage/raw/index/leveldb/interface_test.go
index 3b005d7457..99959d02d1 100644
--- a/storage/raw/index/leveldb/interface_test.go
+++ b/storage/raw/index/leveldb/interface_test.go
@@ -1,4 +1,4 @@
-// Copyright 2012 Prometheus Team
+// Copyright 2013 Prometheus Team
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
diff --git a/storage/raw/index/leveldb/leveldb.go b/storage/raw/index/leveldb/leveldb.go
index df5456c952..f527da08d9 100644
--- a/storage/raw/index/leveldb/leveldb.go
+++ b/storage/raw/index/leveldb/leveldb.go
@@ -1,4 +1,4 @@
-// Copyright 2012 Prometheus Team
+// Copyright 2013 Prometheus Team
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
diff --git a/storage/raw/interface.go b/storage/raw/interface.go
index 67103ba2b3..c552710fdf 100644
--- a/storage/raw/interface.go
+++ b/storage/raw/interface.go
@@ -1,4 +1,4 @@
-// Copyright 2012 Prometheus Team
+// Copyright 2013 Prometheus Team
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
diff --git a/storage/raw/leveldb/interface_test.go b/storage/raw/leveldb/interface_test.go
index 25158470fd..141267a996 100644
--- a/storage/raw/leveldb/interface_test.go
+++ b/storage/raw/leveldb/interface_test.go
@@ -1,4 +1,4 @@
-// Copyright 2012 Prometheus Team
+// Copyright 2013 Prometheus Team
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
diff --git a/storage/raw/leveldb/leveldb.go b/storage/raw/leveldb/leveldb.go
index fffb2d4a3a..a82331bc0c 100644
--- a/storage/raw/leveldb/leveldb.go
+++ b/storage/raw/leveldb/leveldb.go
@@ -1,4 +1,4 @@
-// Copyright 2012 Prometheus Team
+// Copyright 2013 Prometheus Team
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
diff --git a/utility/set.go b/utility/set.go
index f2a565a72c..fee3b37cc7 100644
--- a/utility/set.go
+++ b/utility/set.go
@@ -1,4 +1,4 @@
-// Copyright 2012 Prometheus Team
+// Copyright 2013 Prometheus Team
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
diff --git a/utility/set_test.go b/utility/set_test.go
index 5938ed7e55..81400a333e 100644
--- a/utility/set_test.go
+++ b/utility/set_test.go
@@ -1,4 +1,4 @@
-// Copyright 2012 Prometheus Team
+// Copyright 2013 Prometheus Team
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
diff --git a/utility/test/interface.go b/utility/test/interface.go
index e0750af3de..e46e85f9e6 100644
--- a/utility/test/interface.go
+++ b/utility/test/interface.go
@@ -1,4 +1,4 @@
-// Copyright 2012 Prometheus Team
+// Copyright 2013 Prometheus Team
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at