MetricTapHost

The device side of a metric tap: a peer that offers its converged metric buffer for extraction.

An app that wants its metrics reachable from a test or CI process calls installMetricTap once. From then on the device hosts a small session another peer can join to pull the metrics out of — handy on a phone or simulator where metrics are otherwise hard to get at. Until installMetricTap is called, nothing is opened: the tap is entirely opt-in.

Under the surface the host rides a Quilter over the woven Seam, replicating the device's MetricCatalog (counters, gauges, cardinalities) to whoever joins. Replication is idempotent by construction, so a puller that reconnects converges without double-counting.

Close the returned host to stop offering metrics and release the replicator.