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I've added a metric to count how many villagers there are. These are labelled by world type (desert, plains, etc), profession, and level.
I'm not sure what the performance impact of having 4 labels could be - do you think it will be okay? I think the 'level' label could be removed at the least.
README has been updated, unit tests added/updated, and I've bumped the version number.
I also tidied up the code a bit (unused imports, that sort of thing).
Grafana stacked graph: