Github user smurakozi commented on a diff in the pull request:
https://github.com/apache/spark/pull/19775#discussion_r166894977
--- Diff:
core/src/main/scala/org/apache/spark/metrics/sink/PrometheusSink.scala ---
@@ -0,0 +1,160 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 org.apache.spark.metrics.sink
+
+import java.net.URI
+import java.util
+import java.util.Properties
+import java.util.concurrent.TimeUnit
+
+import scala.collection.JavaConverters._
+import scala.util.Try
+
+import com.codahale.metrics._
+import io.prometheus.client.CollectorRegistry
+import io.prometheus.client.dropwizard.DropwizardExports
+
+import org.apache.spark.{SecurityManager, SparkConf, SparkContext,
SparkEnv}
+import org.apache.spark.internal.Logging
+import org.apache.spark.internal.config.METRICS_NAMESPACE
+import org.apache.spark.metrics.MetricsSystem
+import
org.apache.spark.metrics.prometheus.client.exporter.PushGatewayWithTimestamp
+
+
+private[spark] class PrometheusSink(
+ val property: Properties,
+ val registry: MetricRegistry,
+ securityMgr: SecurityManager)
--- End diff --
`securityMgr` is never used
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