fix linter

Author: KirillKurdyukov

slo/src/Internal/SloTableContext.cs

@@ -5,7 +5,6 @@
 using NLog.Extensions.Logging;
 using Prometheus;
 using Ydb.Sdk;
-using Ydb.Sdk.Ado;
 
 namespace Internal;
 
@@ -181,12 +180,6 @@ async Task ShootingTask(RateLimiter rateLimitPolicy, string operationType, Func<
                 "Current number of pending operations, categorized by type."
             );
 
-            var errorsTotal = metricFactory.CreateCounter(
-                "sdk_errors_total",
-                "Total number of errors encountered, categorized by error type.",
-                ["error_type"]
-            );
-
             var workJobs = new List<Task>();
 
             for (var i = 0; i < 10; i++)