diff --git a/plugins/stats-collector/src/com/intellij/completion/settings/CompletionMLRankingSettings.java b/plugins/stats-collector/src/com/intellij/completion/settings/CompletionMLRankingSettings.java
deleted file mode 100644
index 67431684a14c..000000000000
--- a/plugins/stats-collector/src/com/intellij/completion/settings/CompletionMLRankingSettings.java
+++ /dev/null
@@ -1,51 +0,0 @@
-// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
-package com.intellij.completion.settings;
-
-import com.intellij.stats.completion.sender.SenderPreloadingActivityKt;
-import org.jetbrains.annotations.ApiStatus;
-import org.jetbrains.annotations.NotNull;
-
-/**
- * @deprecated Use {@link com.intellij.completion.ml.settings.CompletionMLRankingSettings} instead.
- */
-@Deprecated
-@ApiStatus.ScheduledForRemoval(inVersion = "2021.3")
-public final class CompletionMLRankingSettings {
-  private static final CompletionMLRankingSettings instance = new CompletionMLRankingSettings();
-
-  private final com.intellij.completion.ml.settings.CompletionMLRankingSettings actualInstance =
-    com.intellij.completion.ml.settings.CompletionMLRankingSettings.getInstance();
-
-  @NotNull
-  public static CompletionMLRankingSettings getInstance() {
-    return instance;
-  }
-
-  public boolean isRankingEnabled() {
-    return actualInstance.isRankingEnabled();
-  }
-
-  public void setRankingEnabled(boolean value) {
-    actualInstance.setRankingEnabled(value);
-  }
-
-  public boolean isLanguageEnabled(@NotNull String rankerId) {
-    return actualInstance.isLanguageEnabled(rankerId);
-  }
-
-  public void setLanguageEnabled(@NotNull String rankerId, boolean isEnabled) {
-    actualInstance.setLanguageEnabled(rankerId, isEnabled);
-  }
-
-  public boolean isShowDiffEnabled() {
-    return actualInstance.isShowDiffEnabled();
-  }
-
-  public void setShowDiffEnabled(boolean isEnabled) {
-    actualInstance.setShowDiffEnabled(isEnabled);
-  }
-
-  public boolean isCompletionLogsSendAllowed() {
-    return SenderPreloadingActivityKt.isCompletionLogsSendAllowed();
-  }
-}
diff --git a/plugins/stats-collector/src/com/intellij/stats/experiment/EmulatedExperiment.kt b/plugins/stats-collector/src/com/intellij/stats/experiment/EmulatedExperiment.kt
deleted file mode 100644
index 4829cf1c9eb8..000000000000
--- a/plugins/stats-collector/src/com/intellij/stats/experiment/EmulatedExperiment.kt
+++ /dev/null
@@ -1,16 +0,0 @@
-// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
-package com.intellij.stats.experiment
-
-import com.intellij.lang.Language
-import org.jetbrains.annotations.ApiStatus
-
-@Deprecated("Left for compatibility. Will be removed in future release.")
-@ApiStatus.ScheduledForRemoval(inVersion = "2021.3")
-class EmulatedExperiment {
-  companion object {
-    fun shouldRank(language: Language, experimentVersion: Int): Boolean = false
-    fun isInsideExperiment(experimentVersion: Int): Boolean = false
-  }
-
-  fun emulate(experimentVersion: Int, performExperiment: Boolean, salt: String): Int? = null
-}
diff --git a/plugins/stats-collector/src/com/intellij/stats/experiment/WebServiceStatus.kt b/plugins/stats-collector/src/com/intellij/stats/experiment/WebServiceStatus.kt
deleted file mode 100644
index 438a092cc07d..000000000000
--- a/plugins/stats-collector/src/com/intellij/stats/experiment/WebServiceStatus.kt
+++ /dev/null
@@ -1,26 +0,0 @@
-// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
-package com.intellij.stats.experiment
-
-import org.jetbrains.annotations.ApiStatus
-
-@Deprecated("Left for compatibility. Will be removed in future release.")
-@ApiStatus.ScheduledForRemoval(inVersion = "2021.3")
-interface WebServiceStatus {
-  companion object {
-    private val fakeWebServiceStatus = object : WebServiceStatus {
-      override fun isServerOk(): Boolean = false
-      override fun dataServerUrl(): String = ""
-      override fun isExperimentOnCurrentIDE(): Boolean = false
-      override fun experimentVersion(): Int = 2
-      override fun updateStatus() = Unit
-    }
-    fun getInstance() = fakeWebServiceStatus
-  }
-
-  fun isServerOk(): Boolean
-  fun dataServerUrl(): String
-  fun isExperimentOnCurrentIDE(): Boolean
-  fun experimentVersion(): Int
-  fun updateStatus()
-}
-