effectful-data-cache-opentelemetry

effectful-data-cache-opentelemetry

traceCache wraps every operation in an OpenTelemetry span (cache.insert, cache.lookup, …), with cache.hit on lookups and cache.size on size/keys. Keys and values are never recorded.

import Effectful.Cache.OpenTelemetry (traceCache)

main = runEff . runCache Nothing . traceCache tracer $ do
  insert "key" (42 :: Int)

It is an interposer, so it layers over any interpreter and can be omitted without touching call sites.