Replace space and dot by underscore in Prometheus metric names #59
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Prometheus metric names must follow the regex
[a-zA-Z_][a-zA-Z0-9_]*(source: https://prometheus.io/docs/concepts/data_model/#metric-names-and-labels).Currently
-is replaced automatically by_. I think it makes sense to also catch space and dot (actually, we did use dots and broke our metrics 馃槶 ).