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Maintainers confirmed this is the live-reload bug tracked in refinery issue #807, fixed in PR #810: the metrics/libhoney client was being torn down on rules reload and subsequent metric reports were sent on a closed channel. Upgrade to a Refinery release containing the fix (the fix landed shortly after the 1.19/2.0.2 era).
Source: https://github.com/honeycombio/refinery/issues/595