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The DigitalOcean rate limits were another challenge. To avoid hitting them, I had to ensure long enough intervals for reading metrics and provide the ability to use multiple keys. I also created my own rate limiter, which you can find here.
I used the prometheus library because it was the most popular and easiest to find. Some unusual and unexpected aspects were that, to delete metrics, all labels must be specified at once, and to record metrics, I always needed the full list of labels that were used during creation. However, these issues were manageable.