add missing label on replicator metrics and unit test #229
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The storage type label is missing from metrics blob replicator, causing the initialization to fail on:
panic: 1 unknown label(s) found during currying
goroutine 1 [running]:
github.com/prometheus/client_golang/prometheus.(*HistogramVec).MustCurryWith(...)
external/gazelle~~go_deps~com_github_prometheus_client_golang/prometheus/histogram.go:1278
Also, add a unit test to catch this case.