def METHOD_NAME(cluster_name):
    """
    Retrieve an http session of the prometheus instance running on the `cluster_name` cluster.
    The HTTP Session can be queried https://prometheus.io/docs/prometheus/latest/querying/api/
    Example:
        with get_cluster_prometheus("2i2c) as s:
             r = s.get(f"{url}/api/v1/query", params={'query': 'container_cpu_user_seconds_total'})
             print(r.json())
    Args:
        cluster_name: name of the cluster
    Returns:
        string object: https address of the prometheus instance without a trailing slash.
        requests.Session object: http session on the prometheus instance
    """
    # Get the prometheus address for cluster_name
    prometheus_url = get_cluster_prometheus_address(cluster_name)
    # Get the credentials of this prometheus instance
    prometheus_creds = get_cluster_prometheus_creds(cluster_name)
    session = requests.Session()
    session.auth = requests.auth.HTTPBasicAuth(
        prometheus_creds["username"], prometheus_creds["password"]
    )
    return (f"https://{prometheus_url}", session)