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diff --git a/src/mongo/util/testing_proctor.cpp b/src/mongo/util/testing_proctor.cpp
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+++ b/src/mongo/util/testing_proctor.cpp
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+/**
+ *    Copyright (C) 2020-present MongoDB, Inc.
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the Server Side Public License, version 1,
+ *    as published by MongoDB, Inc.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    Server Side Public License for more details.
+ *
+ *    You should have received a copy of the Server Side Public License
+ *    along with this program. If not, see
+ *    <http://www.mongodb.com/licensing/server-side-public-license>.
+ *
+ *    As a special exception, the copyright holders give permission to link the
+ *    code of portions of this program with the OpenSSL library under certain
+ *    conditions as described in each individual source file and distribute
+ *    linked combinations including the program with the OpenSSL library. You
+ *    must comply with the Server Side Public License in all respects for
+ *    all of the code used other than as permitted herein. If you modify file(s)
+ *    with this exception, you may extend this exception to your version of the
+ *    file(s), but you are not obligated to do so. If you do not wish to do so,
+ *    delete this exception statement from your version. If you delete this
+ *    exception statement from all source files in the program, then also delete
+ *    it in the license file.
+ */
+
+#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kDefault
+
+#include "mongo/util/testing_proctor.h"
+
+#include "mongo/base/init.h"
+#include "mongo/logv2/log.h"
+#include "mongo/util/assert_util.h"
+#include "mongo/util/static_immortal.h"
+
+namespace mongo {
+
+TestingProctor& TestingProctor::instance() {
+    static StaticImmortal<TestingProctor> proctor{};
+    return proctor.value();
+}
+
+bool TestingProctor::isEnabled() const {
+    uassert(ErrorCodes::NotYetInitialized,
+            "Cannot check whether testing diagnostics is enabled before it is initialized",
+            isInitialized());
+    return _diagnosticsEnabled.get();
+}
+
+void TestingProctor::setEnabled(bool enable) {
+    if (!isInitialized()) {
+        _diagnosticsEnabled = enable;
+        return;
+    }
+
+    uassert(ErrorCodes::AlreadyInitialized,
+            "Cannot alter testing diagnostics once initialized",
+            _diagnosticsEnabled.get() == enable);
+
+    LOGV2(4672601, "Overriding testing diagnostics", "enabled"_attr = enable);
+}
+
+namespace {
+
+/**
+ * The initializer ensures that testing diagnostics is always initialized (by default to disabled),
+ * especially for those executables that never call into `setEnabled()` (e.g., the mongo shell).
+ */
+MONGO_INITIALIZER(DisableTestingDiagnosticsByDefault)(InitializerContext*) {
+    if (!TestingProctor::instance().isInitialized()) {
+        TestingProctor::instance().setEnabled(false);
+    }
+    return Status::OK();
+}
+
+}  // namespace
+}  // namespace mongo