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There is a newer version: 3.11.0-rc3

// Copyright (C) 2012 The Android Open Source Project
//
// 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 com.google.gerrit.server.git;

import com.google.common.flogger.backend.Platform;
import com.google.gerrit.extensions.events.LifecycleListener;
import com.google.gerrit.server.config.GerritServerConfig;
import com.google.gerrit.server.config.SitePaths;
import com.google.gerrit.server.util.SystemLog;
import com.google.inject.Inject;
import java.nio.file.Path;
import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;
import org.apache.log4j.PatternLayout;
import org.eclipse.jgit.lib.Config;

public class GarbageCollectionLogFile implements LifecycleListener {
  private static final String LOG_NAME = "gc_log";

  @Inject
  public GarbageCollectionLogFile(SitePaths sitePaths, @GerritServerConfig Config config) {
    if (SystemLog.shouldConfigure()) {
      initLogSystem(sitePaths.logs_dir, config.getBoolean("log", "rotate", true));
    }
  }

  @Override
  public void start() {}

  @Override
  public void stop() {
    getLogger(GarbageCollection.class).removeAllAppenders();
    getLogger(GarbageCollectionRunner.class).removeAllAppenders();
  }

  private static void initLogSystem(Path logdir, boolean rotate) {
    initGcLogger(logdir, rotate, getLogger(GarbageCollection.class));
    initGcLogger(logdir, rotate, getLogger(GarbageCollectionRunner.class));
  }

  private static Logger getLogger(Class clazz) {
    return LogManager.getLogger(Platform.getBackend(clazz.getName()).getLoggerName());
  }

  private static void initGcLogger(Path logdir, boolean rotate, Logger gcLogger) {
    gcLogger.removeAllAppenders();
    gcLogger.addAppender(
        SystemLog.createAppender(
            logdir, LOG_NAME, new PatternLayout("[%d] %-5p %x: %m%n"), rotate));
    gcLogger.setAdditivity(false);
  }
}