docs: public NettyServerBuilder maxConnectionAgeGrace(long maxConnectionAgeGrace, TimeUnit timeUnit) {
      checkArgument(maxConnectionAgeGrace >= 0L, "max connection age grace must be non-negative");
      maxConnectionAgeGraceInNanos = timeUnit.toNanos(maxConnectionAgeGrace);
      if (maxConnectionAgeGraceInNanos >= AS_LARGE_AS_INFINITE) {
        maxConnectionAgeGraceInNanos = MAX_CONNECTION_AGE_GRACE_NANOS_INFINITE;
      }
      return this;
    }