Full changelog General: A new metric glean.error.io has been added, counting the times an IO error happens when writing a pending ping to disk (#1428) Android A new metric glean.validation.foreground_count was added to the metrics ping (#1418). Rust BUGFIX: Fix lock order inversion in RLB Timing Distribution (#1431). Use RLB types instead of glean-core ones for RLB core metrics. (#1432).
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