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custom_messages has bug that causes locust worker restarts. locustio/locust#2608
We rely on custom messages for our custom metrics csv file periodic writes.
Since we've added in exporting the custom metrics to prometheus, I don't think we need the csv file write. The locust runner includes these metrics in its final report. And metrics are viewable via custom dashboards in cloud monitoring.
Rather than trying to make the heartbeat work, I think we should remove the csv file support and migrate to improving the total report that includes locust and GPU metrics as well.
This change also enables custom metrics for all workloads.