Metrics (Prometheus)

Prometheus metrics registry and bucket/aggregation constants.

The redup_servicekit.metrics module contains:

• redup_servicekit.metrics.PROMETHEUS_METRICS_REGISTRY — singleton registry for metrics

• redup_servicekit.metrics.OPERATION_EXPAND_METRICS — aggregation name to function

• redup_servicekit.metrics.BUCKETS_HIST — histogram bucket boundaries for time/size