Add reduce step between Prometheus query and threshold to preserve
per-service labels. Without it, Grafana can't distinguish the 5
probe_success series and errors with "duplicate results with labels {}".
Chain: A (prometheus query) → B (reduce last) → C (threshold < 1)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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