diff --git a/internal/exp/metrics/go.mod b/internal/exp/metrics/go.mod
index ca0a23cb1e86..6e54eb33f229 100644
--- a/internal/exp/metrics/go.mod
+++ b/internal/exp/metrics/go.mod
@@ -1,6 +1,6 @@
 module github.com/open-telemetry/opentelemetry-collector-contrib/internal/exp/metrics
 
-go 1.20
+go 1.21
 
 require (
 	github.com/open-telemetry/opentelemetry-collector-contrib/pkg/pdatautil v0.95.0
@@ -28,5 +28,3 @@ require (
 )
 
 replace github.com/open-telemetry/opentelemetry-collector-contrib/pkg/pdatautil => ../../../pkg/pdatautil
-
-toolchain go1.21.1
diff --git a/internal/exp/metrics/go.sum b/internal/exp/metrics/go.sum
index 1c3e08163635..9a5008b4d916 100644
--- a/internal/exp/metrics/go.sum
+++ b/internal/exp/metrics/go.sum
@@ -17,7 +17,9 @@ github.com/json-iterator/go v1.1.12/go.mod h1:e30LSqwooZae/UwlEbR2852Gd8hjQvJoHm
 github.com/kisielk/errcheck v1.5.0/go.mod h1:pFxgyoBC7bSaBwPgfKdkLd5X25qrDl4LWUI2bnpBCr8=
 github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
 github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
+github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
 github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
+github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
 github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
 github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd h1:TRLaZ9cD/w8PVh93nsPXa1VrQ6jlwL5oN8l14QlcNfg=
 github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
@@ -26,6 +28,7 @@ github.com/modern-go/reflect2 v1.0.2/go.mod h1:yWuevngMOJpCy52FWWMvUC8ws7m/LJsjY
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/rogpeppe/go-internal v1.10.0 h1:TMyTOH3F/DB16zRVcYyreMH6GnZZrwQVAoYjRBZyWFQ=
+github.com/rogpeppe/go-internal v1.10.0/go.mod h1:UQnix2H7Ngw/k4C5ijL5+65zddjncjaFoBhdsK/akog=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
@@ -79,5 +82,6 @@ google.golang.org/protobuf v1.32.0 h1:pPC6BG5ex8PDFnkbrGU3EixyhKcQ2aDuBS36lqK/C7
 google.golang.org/protobuf v1.32.0/go.mod h1:c6P6GXX6sHbq/GpV6MGZEdwhWPcYBgnhAHhKbcUYpos=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
diff --git a/internal/exp/metrics/staleness/map.go b/internal/exp/metrics/staleness/map.go
index 622f27ef1a21..77b29f5febd2 100644
--- a/internal/exp/metrics/staleness/map.go
+++ b/internal/exp/metrics/staleness/map.go
@@ -1,4 +1,7 @@
-package staleness
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package staleness // import "github.com/open-telemetry/opentelemetry-collector-contrib/internal/exp/metrics/staleness"
 
 import (
 	"time"
diff --git a/internal/exp/metrics/staleness/priority_queue.go b/internal/exp/metrics/staleness/priority_queue.go
index d43676f15416..f1b01743f95f 100644
--- a/internal/exp/metrics/staleness/priority_queue.go
+++ b/internal/exp/metrics/staleness/priority_queue.go
@@ -1,7 +1,7 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-package staleness
+package staleness // import "github.com/open-telemetry/opentelemetry-collector-contrib/internal/exp/metrics/staleness"
 
 import (
 	"container/heap"
diff --git a/internal/exp/metrics/staleness/staleness.go b/internal/exp/metrics/staleness/staleness.go
index 481149b2f7b8..34c53e3702cd 100644
--- a/internal/exp/metrics/staleness/staleness.go
+++ b/internal/exp/metrics/staleness/staleness.go
@@ -1,7 +1,7 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-package staleness
+package staleness // import "github.com/open-telemetry/opentelemetry-collector-contrib/internal/exp/metrics/staleness"
 
 import (
 	"time"
diff --git a/internal/exp/metrics/staleness/staleness_test.go b/internal/exp/metrics/staleness/staleness_test.go
index 00137d6e1ad5..688a6c7b3c0b 100644
--- a/internal/exp/metrics/staleness/staleness_test.go
+++ b/internal/exp/metrics/staleness/staleness_test.go
@@ -1,3 +1,6 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
 package staleness
 
 import (