dask/distributed

AI Summary: The task is to debug a Dask distributed scheduler issue where the `/metrics` endpoint sometimes fails to expose Dask-specific metrics (e.g., `dask_*` metrics) when using Prometheus for monitoring. The problem seems to be related to timing; querying the endpoint before the worker is fully initialized results in missing metrics. The solution involves investigating the timing dependency between worker initialization and metric exposure, potentially adjusting the logic to ensure metrics are available consistently.