New: Will now temporarily stop using an indexer if the indexer reported an error.

src/NzbDrone.Core/HealthCheck/Checks/IndexerStatusCheck.cs

@@ -0,0 +1,48 @@
+using System;
+using System.Linq;
+using NzbDrone.Common.Extensions;
+using NzbDrone.Core.Indexers;
+
+namespace NzbDrone.Core.HealthCheck.Checks
+{
+    public class IndexerStatusCheck : HealthCheckBase
+    {
+        private readonly IIndexerFactory _indexerFactory;
+        private readonly IIndexerStatusService _indexerStatusService;
+
+        public IndexerStatusCheck(IIndexerFactory indexerFactory, IIndexerStatusService indexerStatusService)
+        {
+            _indexerFactory = indexerFactory;
+            _indexerStatusService = indexerStatusService;
+        }
+
+        public override HealthCheck Check()
+        {
+            var enabledIndexers = _indexerFactory.GetAvailableProviders();
+            var backOffIndexers = enabledIndexers.Join(_indexerStatusService.GetBlockedIndexers(),
+                    i => i.Definition.Id,
+                    s => s.IndexerId,
+                    (i, s) => new { Indexer = i, Status = s })
+                .Where(v => (v.Status.MostRecentFailure - v.Status.InitialFailure) > TimeSpan.FromHours(1))
+                .ToList();
+
+            if (backOffIndexers.Empty())
+            {
+                return new HealthCheck(GetType());
+            }
+
+            if (backOffIndexers.Count == enabledIndexers.Count)
+            {
+                return new HealthCheck(GetType(), HealthCheckResult.Error, "All indexers are unavailable due to failures", "#indexers-are-unavailable-due-to-failures");
+            }
+
+            if (backOffIndexers.Count > 1)
+            {
+                return new HealthCheck(GetType(), HealthCheckResult.Warning, string.Format("{0} indexers are unavailable due to failures", backOffIndexers.Count), "#indexers-are-unavailable-due-to-failures");
+            }
+
+            var indexer = backOffIndexers.First();
+            return new HealthCheck(GetType(), HealthCheckResult.Warning, string.Format("Indexer {0} is unavailable due to failures", indexer.Indexer.Definition.Name), "#indexers-are-unavailable-due-to-failures");
+        }
+    }
+}