[draft] Rework metrics to use metrics crate #361
Draft
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This simplifies metrics a lot by using the
metrics
crate. Themetrics
crate functions similar to thelog
crate in that libraries just callcounter!
,gauge!
orhistogram!
to record metrics, and the user of the library can decide where to send the metrics by installing an appropriate recorder/exporter.TODO: track error by code&message like before. Track function calls by name and count. Rename static strings. Consider whether to always emit metrics