Collect statistics for inlay parameter options

idea/src/META-INF/plugin.xml

@@ -2795,6 +2795,7 @@
                   serviceImplementation="org.jetbrains.uast.kotlin.internal.IdeaKotlinUastBindingContextProviderService"/>
 
     <statistics.usagesCollector implementation="org.jetbrains.kotlin.idea.formatter.KotlinFormatterUsageCollector" />
+    <statistics.usagesCollector implementation="org.jetbrains.kotlin.idea.parameterInfo.KotlinInlayParameterHintsUsageCollector" />
   </extensions>
 
   <xi:include href="tipsAndTricks.xml" xpointer="xpointer(/idea-plugin/*)"/>

idea/src/org/jetbrains/kotlin/idea/parameterInfo/KotlinInlayParameterHintsUsageCollector.kt

@@ -0,0 +1,29 @@
+/*
+ * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.idea.parameterInfo
+
+import com.intellij.codeInsight.hints.InlayParameterHintsExtension
+import com.intellij.internal.statistic.UsagesCollector
+import com.intellij.internal.statistic.beans.GroupDescriptor
+import com.intellij.internal.statistic.beans.UsageDescriptor
+import com.intellij.internal.statistic.utils.getBooleanUsage
+import org.jetbrains.kotlin.idea.KotlinLanguage
+
+class KotlinInlayParameterHintsUsageCollector : UsagesCollector() {
+    override fun getGroupId(): GroupDescriptor = GroupDescriptor.create(GROUP_ID)
+
+    override fun getUsages(): Set<UsageDescriptor> {
+        val provider = InlayParameterHintsExtension.forLanguage(KotlinLanguage.INSTANCE) ?: return emptySet()
+
+        return provider.supportedOptions.mapTo(LinkedHashSet()) {
+            getBooleanUsage(it.id, it.get())
+        }
+    }
+
+    companion object {
+        private const val GROUP_ID = "kotlin.hints.inlay"
+    }
+}