fix issue with multiple aggregated counter for monitoring

Hangfire.MemoryStorage.nuspec

@@ -2,11 +2,11 @@
 <package xmlns="http://schemas.microsoft.com/packaging/2011/08/nuspec.xsd">
   <metadata>
     <id>Hangfire.MemoryStorage</id>
-    <version>1.8.0.0</version>
+    <version>1.8.1.0</version>
     <title>Hangfire.MemoryStorage</title>
     <authors>PERRICHOT Florian</authors>
     <owners>PERRICHOT Florian</owners>
-    <license type="expression">APACHE LICENSE, VERSION 2.0</license>
+    <licenseUrl>https://www.apache.org/licenses/LICENSE-2.0.html</licenseUrl>
     <projectUrl>https://github.com/perrich/Hangfire.MemoryStorage</projectUrl>
     <requireLicenseAcceptance>false</requireLicenseAcceptance>
     <description>A memory storage for Hangfire</description>

src/Hangfire.MemoryStorage.UnitTest/MemoryStorageMonitoringApiTests.cs

@@ -0,0 +1,29 @@
+
+using Hangfire.MemoryStorage.Database;
+using Hangfire.MemoryStorage.Dto;
+using Hangfire.MemoryStorage;
+
+namespace Hangfire.MemoryStorage.UnitTest;
+
+public class MemoryStorageMonitoringApiTests
+{
+    private Data data;
+    private MemoryStorageMonitoringApi monitoringApi;
+
+    public MemoryStorageMonitoringApiTests()
+    {
+        data = new Data();
+        monitoringApi = new MemoryStorageMonitoringApi(data);
+    }
+
+    [Fact]
+    public void MonitoringShouldReturnSumOfCounterIfTwoAggregatedCounterDtoHaveSameKey()
+    {
+        var key = string.Format("stats:succeeded:{0}", DateTime.UtcNow.AddHours(-2).ToString("yyyy-MM-dd-HH"));
+        data.Create(new AggregatedCounterDto { Id = 1, Key = key, Value = 5 });
+        data.Create(new AggregatedCounterDto { Id = 2, Key = key, Value = 2 }); // Creation in CountersAggregator can produce two object in concurrent environment
+
+        var stats = monitoringApi.HourlySucceededJobs().ToArray();
+        Assert.Equal(7, stats[2].Value);
+    }
+}

src/Hangfire.MemoryStorage/Hangfire.MemoryStorage.csproj

@@ -2,9 +2,9 @@
 
   <PropertyGroup>
     <Description>A memory storage for Hangfire</Description>
-    <Copyright>Copyright 2015-2023</Copyright>
+    <Copyright>Copyright 2015-2024</Copyright>
     <AssemblyTitle>Hangfire.MemoryStorage</AssemblyTitle>
-    <VersionPrefix>1.8.0</VersionPrefix>
+    <VersionPrefix>1.8.1</VersionPrefix>
     <Authors>PERRICHOT Florian</Authors>
     <TargetFrameworks>net45;netstandard1.3</TargetFrameworks>
     <AssemblyName>Hangfire.MemoryStorage</AssemblyName>
@@ -14,8 +14,8 @@
     <RepositoryType>git</RepositoryType>
     <RepositoryUrl>https://github.com/perrich/Hangfire.MemoryStorage</RepositoryUrl>
     <NetStandardImplicitPackageVersion>1.6.0</NetStandardImplicitPackageVersion>
-    <Version>1.8.0</Version>
-    <AssemblyVersion>1.8.0.0</AssemblyVersion>
+    <Version>1.8.1</Version>
+    <AssemblyVersion>1.8.1.0</AssemblyVersion>
   </PropertyGroup>
 
   <ItemGroup>

src/Hangfire.MemoryStorage/MemoryStorageMonitoringApi.cs

@@ -285,9 +285,11 @@ private Dictionary<DateTime, long> GetTimelineStats(List<DateTime> dates,
             var counters = _data.GetEnumeration<AggregatedCounterDto>();
             var keyMap = dates.ToDictionary(formatorAction, x => x);
 
-            var valuesMap = (from c in counters
-                where keyMap.Keys.Contains(c.Key)
-                select c).ToDictionary(o => o.Key, o => o.Value);
+            var valuesMap = counters
+                .Where(c => keyMap.Keys.Contains(c.Key))
+                .GroupBy(c => c.Key)
+                .Select(g => new { g.Key, Sum = g.Sum(c => c.Value) })
+                .ToDictionary(o => o.Key, o => o.Sum);
 
             foreach (var key in keyMap.Keys.Where(key => !valuesMap.ContainsKey(key)))
             {