ria-label="Table of Contents"><div id=toc><ol><li role=none aria-label="External and internal services"><a href=#external-and-internal-services>External and internal services</a><li role=none aria-label="What are BlackHole and Passthrough clusters?"><a href=#what-are-blackhole-and-passthrough-clusters>What are BlackHole and Passthrough clusters?</a><li role=none aria-label="Using the augmented metrics"><a href=#using-the-augmented-metrics>Using the augmented metrics</a><ol><li role=none aria-label="Passthro