from typing import Tuple


def extract_metrics_from_arm(arm: str) -> Tuple[str, str]:
    """Arm names have to following format:
    host1.metric1-host2.metric2

    Extracts and returns the name of the two metrics from the arm.

    Args:
      arm (string): Name of the arm in format host1.metrics1-host2.metric2

    Returns:
      (string, string): Names of the hosts
    """
    host_metrics = arm.split('-')
    metrics1, metrics2 = host_metrics[0][9:], host_metrics[1][9:]

    return metrics1, metrics2