Добавил метод для получения нагрузки на процессор

Backend/MonitorAgent/MonitorAgent.Core/Abstraction/ICpuMonitorService.cs

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+using MonitorAgent.Core.Models;
+
+namespace MonitorAgent.Core.Abstraction;
+
+public interface ICpuMonitorService
+{
+    public Task<RawCpuStatsCollection> ParseRawCpuStatsAsync(CancellationToken cancellationToken = default);
+}

Backend/MonitorAgent/MonitorAgent.Core/Models/CpuUsage.cs

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+using System.Collections.ObjectModel;
+
+namespace MonitorAgent.Core.Models;
+
+public class CpuUsage(decimal totalUsagePercent, IEnumerable<decimal> coresUsagePercent)
+{
+    public readonly decimal TotalUsagePercent = totalUsagePercent;
+    public readonly ReadOnlyCollection<decimal> CoresUsagePercent = new([.. coresUsagePercent]);
+}

Backend/MonitorAgent/MonitorAgent.Core/Models/RawCpuStats.cs

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+namespace MonitorAgent.Core.Models;
+
+public struct RawCpuStats
+{
+    public long User { get; set; }
+    public long Nice { get; set; }
+    public long System { get; set; }
+    public long Idle { get; set; }
+    public long Iowait { get; set; }
+    public long Irq { get; set; }
+    public long Softirq { get; set; }
+    public long Steal { get; set; }
+    public long Guest { get; set; }
+    public long GuestNice { get; set; }
+
+    public readonly long Total => User + Nice + System + Idle + Irq + Softirq + Steal;
+    public readonly long TotalIdle => Idle + Iowait;
+
+    public static RawCpuStats Parse(string s)
+    {
+        var stats = s.Split();
+        if (!stats[0].StartsWith("cpu"))
+            throw new FormatException($"The input string '{s}' was not in a correct format.");
+
+        var longStats = new List<long>();
+        for (int i = 1; i < stats.Length; i++)
+        {
+            if (!string.IsNullOrEmpty(stats[i]))
+                longStats.Add(long.Parse(stats[i]));
+        }
+
+        return new RawCpuStats
+        {
+            User      = longStats[0],
+            Nice      = longStats[1],
+            System    = longStats[2],
+            Idle      = longStats[3],
+            Iowait    = longStats[4],
+            Irq       = longStats[5],
+            Softirq   = longStats[6],
+            Steal     = longStats[7],
+            Guest     = longStats[8],
+            GuestNice = longStats[9]
+        };
+    }
+}

Backend/MonitorAgent/MonitorAgent.Core/Models/RawCpuStatsCollection.cs

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+using System.Collections;
+using System.Collections.ObjectModel;
+
+namespace MonitorAgent.Core.Models;
+
+public class RawCpuStatsCollection(RawCpuStats total, IEnumerable<RawCpuStats> cores)
+{
+    public readonly RawCpuStats Total = total;
+    public readonly ReadOnlyCollection<RawCpuStats> Cores = new([.. cores]);
+}