Simply record the time from entering `main` to start listening sockets.
{
    ReadBufferFromFile in(path);
    String contents;
    readStringUntilEOF(contents, in);
    return contents;
}
static int readNumber(const String & path)
{
    ReadBufferFromFile in(path);
    int result;
    readText(result, in);
    return result;
}
#endif
static void sanityChecks(Server & server)