diff --git a/rules/mapping.go b/rules/mapping.go
index 88f6ad6..78f1a7b 100644
--- a/rules/mapping.go
+++ b/rules/mapping.go
@@ -32,9 +32,9 @@ import (
 )
 
 var (
-	errMappingRuleSnapshotIdxOutOfRange = errors.New("mapping rule snapshot index out of range")
-	errNilMappingRuleSnapshotSchema     = errors.New("nil mapping rule snapshot schema")
-	errNilMappingRuleSchema             = errors.New("nil mapping rule schema")
+	errMappingRuleSnapshotIndexOutOfRange = errors.New("mapping rule snapshot index out of range")
+	errNilMappingRuleSnapshotSchema       = errors.New("nil mapping rule snapshot schema")
+	errNilMappingRuleSchema               = errors.New("nil mapping rule schema")
 )
 
 // mappingRuleSnapshot defines a rule snapshot such that if a metric matches the
@@ -147,7 +147,7 @@ type MappingRuleView struct {
 
 func (mc *mappingRule) mappingRuleView(snapshotIdx int) (*MappingRuleView, error) {
 	if snapshotIdx < 0 || snapshotIdx >= len(mc.snapshots) {
-		return nil, errMappingRuleSnapshotIdxOutOfRange
+		return nil, errMappingRuleSnapshotIndexOutOfRange
 	}
 
 	mrs := mc.snapshots[snapshotIdx].clone()
diff --git a/rules/namespace.go b/rules/namespace.go
index b262ef1..37b66fe 100644
--- a/rules/namespace.go
+++ b/rules/namespace.go
@@ -32,16 +32,16 @@ var (
 	emptyNamespace         Namespace
 	emptyNamespaces        Namespaces
 
-	errNamespaceSnapshotIdxOutOfRange = errors.New("namespace snapshot idx out of range")
-	errNilNamespaceSnapshotSchema     = errors.New("nil namespace snapshot schema")
-	errNilNamespaceSchema             = errors.New("nil namespace schema")
-	errNilNamespacesSchema            = errors.New("nil namespaces schema")
-	errNilNamespaceSnapshot           = errors.New("nil namespace snapshot")
-	errMultipleNamespaceMatches       = errors.New("more than one namespace match found")
-	errNamespaceNotFound              = errors.New("namespace not found")
-	errNamespaceNotTombstoned         = errors.New("not tombstoned")
-	errNamespaceTombstoned            = errors.New("already tombstoned")
-	errNoNamespaceSnapshots           = errors.New("no snapshots")
+	errNamespaceSnapshotIndexOutOfRange = errors.New("namespace snapshot idx out of range")
+	errNilNamespaceSnapshotSchema       = errors.New("nil namespace snapshot schema")
+	errNilNamespaceSchema               = errors.New("nil namespace schema")
+	errNilNamespacesSchema              = errors.New("nil namespaces schema")
+	errNilNamespaceSnapshot             = errors.New("nil namespace snapshot")
+	errMultipleNamespaceMatches         = errors.New("more than one namespace match found")
+	errNamespaceNotFound                = errors.New("namespace not found")
+	errNamespaceNotTombstoned           = errors.New("not tombstoned")
+	errNamespaceTombstoned              = errors.New("already tombstoned")
+	errNoNamespaceSnapshots             = errors.New("no snapshots")
 
 	namespaceActionErrorFmt = "cannot %s namespace %s. %v"
 )
@@ -110,7 +110,7 @@ type NamespaceView struct {
 
 func (n Namespace) namespaceView(snapshotIdx int) (*NamespaceView, error) {
 	if snapshotIdx < 0 || snapshotIdx >= len(n.snapshots) {
-		return nil, errNamespaceSnapshotIdxOutOfRange
+		return nil, errNamespaceSnapshotIndexOutOfRange
 	}
 	s := n.snapshots[snapshotIdx]
 	return &NamespaceView{
diff --git a/rules/rollup.go b/rules/rollup.go
index 3ce4cd2..5e3ff4d 100644
--- a/rules/rollup.go
+++ b/rules/rollup.go
@@ -36,10 +36,10 @@ import (
 var (
 	emptyRollupTarget RollupTarget
 
-	errRollupRuleSnapshotIdxOutOfRange = errors.New("rollup rule snapshot index out of range")
-	errNilRollupTargetSchema           = errors.New("nil rollup target schema")
-	errNilRollupRuleSnapshotSchema     = errors.New("nil rollup rule snapshot schema")
-	errNilRollupRuleSchema             = errors.New("nil rollup rule schema")
+	errRollupRuleSnapshotIndexOutOfRange = errors.New("rollup rule snapshot index out of range")
+	errNilRollupTargetSchema             = errors.New("nil rollup target schema")
+	errNilRollupRuleSnapshotSchema       = errors.New("nil rollup rule snapshot schema")
+	errNilRollupRuleSchema               = errors.New("nil rollup rule schema")
 )
 
 // RollupTarget dictates how to roll up metrics. Metrics associated with a rollup
@@ -269,7 +269,7 @@ type RollupRuleView struct {
 
 func (rc *rollupRule) rollupRuleView(snapshotIdx int) (*RollupRuleView, error) {
 	if snapshotIdx < 0 || snapshotIdx >= len(rc.snapshots) {
-		return nil, errRollupRuleSnapshotIdxOutOfRange
+		return nil, errRollupRuleSnapshotIndexOutOfRange
 	}
 
 	rrs := rc.snapshots[snapshotIdx].clone()