diff --git a/core/src/main/scala/prometheus4cats/ExemplarSampler.scala b/core/src/main/scala/prometheus4cats/ExemplarSampler.scala
index 02605bc..105ff2b 100644
--- a/core/src/main/scala/prometheus4cats/ExemplarSampler.scala
+++ b/core/src/main/scala/prometheus4cats/ExemplarSampler.scala
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2022 Permutive
+ *
+ * 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.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package prometheus4cats
 
 import cats.{Applicative, ~>}
diff --git a/core/src/main/scala/prometheus4cats/OutcomeRecorder.scala b/core/src/main/scala/prometheus4cats/OutcomeRecorder.scala
index f11a414..f2deeaa 100644
--- a/core/src/main/scala/prometheus4cats/OutcomeRecorder.scala
+++ b/core/src/main/scala/prometheus4cats/OutcomeRecorder.scala
@@ -19,9 +19,7 @@ package prometheus4cats
 import cats.effect.kernel.syntax.monadCancel._
 import cats.effect.kernel.{Clock, MonadCancelThrow, Outcome}
 import cats.syntax.flatMap._
-import cats.syntax.foldable._
-import cats.syntax.functor._
-import cats.{Applicative, FlatMap, Monad, Show, ~>}
+import cats.{FlatMap, Monad, Show, ~>}
 import prometheus4cats.internal.Neq
 
 /** A derived metric type that records the outcome of an operation. See [[OutcomeRecorder.fromCounter]] and