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The share of time an indexer is reachable and answering queries. Many are run by small volunteer teams on modest hardware, so outages of hours or days happen, and an indexer that is down blocks every automated search pointed at it. Setups that care about continuity configure several indexers with a priority order so a failure falls through to the next one.
Browse all terms in NZB Files & Indexing, or see the full Usenet glossary.