`total_memory_tracker.setOrRaiseHardLimit(...);` in `ConfigReloader` callback (see `Server.cpp`).
#include "Server.h"
#include <memory>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <errno.h>
#include <pwd.h>
#include <unistd.h>
#include <Poco/Version.h>
#include <Poco/DirectoryIterator.h>
#include <Poco/Net/HTTPServer.h>
#include <Poco/Net/NetException.h>
#include <Poco/Util/HelpFormatter.h>
#include <ext/scope_guard.h>
#include <common/logger_useful.h>
#include <common/phdr_cache.h>
#include <common/ErrorHandlers.h>
#include <common/getMemoryAmount.h>
#include <common/errnoToString.h>
#include <common/coverage.h>
#include <Common/ClickHouseRevision.h>
#include <Common/DNSResolver.h>
#include <Common/CurrentMetrics.h>
#include <Common/Macros.h>
#include <Common/StringUtils/StringUtils.h>