def METHOD_NAME():
    """Load the Helm chart configuration used to render the Helm templates of
    the chart from a mounted k8s Secret, and merge in values from an optionally
    mounted secret (hub.existingSecret)."""
    cfg = {}
    for source in ("secret/values.yaml", "existing-secret/values.yaml"):
        path = f"/usr/local/etc/jupyterhub/{source}"
        if os.path.exists(path):
            print(f"Loading {path}")
            with open(path) as f:
                values = yaml.safe_load(f)
            cfg = _merge_dictionaries(cfg, values)
        else:
            print(f"No config at {path}")
    path = f"/opt/cloudharness/resources/allvalues.yaml"
    if os.path.exists(path):
        print("Loading global CloudHarness config at", path)
        with open(path) as f:
            values = yaml.safe_load(f)
        cfg = _merge_dictionaries(cfg, values)
        cfg['root'] = values
    return cfg