Remove gauge metric

Hi all,
I have written a custom exporter for calculating the cost of using a node in AWS.
Here is how it works:
Lets assume I have 3 nodes, each costs 5$/ 1h, when I plot using grafana the sum(cost_metric{}) i get 15$ (3x5$). Lets say after 2 hours one of the nodes get deleted (autoscaling). In that case the total cost should drop to 10$.

The problem is that in my case the metric is preserved and even though the node has been deleted the cost is kept and thus it displays 15$ instead of dropping to 10$

How would I go about saving that problem?

cost_metric = Gauge(
    "cost_metric ",
    "Cost of running an instance for 1 hour",
    ["node_name", "instance_type"],
)
...

node_names = get_nodes()
    for node_name in node_names:
        node_info = get_node_info(node_name)
        if node_info is None:
            continue

        logging.info(f"Updating metrics for node: {node_name}")

        # labels section
        labels = node_info["metadata"]["labels"]
        instance_type = labels.get("beta.kubernetes.io/instance-type", "unknown")
        cost = get_cost_of_instance(instance_type)

        if cost is not None:
            cost_metric.labels(node_name=node_name, instance_type=instance_type).set(cost)

I tried

I collected previous and current nodes in form of dict and then wanted to removed the ones that arent existing, the issue is that :

cost_metric.remove(node_name=node_name, instance_type=instance_type)

Traceback (most recent call last):
  File "/home/XXXX/projects/main.py", line 154, in <module>
    previous_nodes = update_metrics(previous_nodes)
                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/eksohio/projects/main.py", line 131, in update_metrics
    cost.remove(node_name=node_name, instance_type=instance_type)
TypeError: MetricWrapperBase.remove() got an unexpected keyword argument 'node_name'

Payload nêu khai báo Gauge và lệnh gọi MetricWrapperBase.remove trong traceback, nhưng không có tệp nào trong repository hay bài kiểm thử nào. Hãy bắt đầu bằng cách kiểm tra các API của Gauge và MetricWrapperBase để xóa label, đồng thời xem xét vòng lặp exporter được nêu. Hoàn tất khi xác định được cách được hỗ trợ để xóa metric của node đã bị xóa hoặc xác nhận rằng cần thay đổi thư viện.