diff --git a/Vostok.Metrics.System/Host/HostMetricsCollector.cs b/Vostok.Metrics.System/Host/HostMetricsCollector.cs
index 52b719e..a0cc54a 100644
--- a/Vostok.Metrics.System/Host/HostMetricsCollector.cs
+++ b/Vostok.Metrics.System/Host/HostMetricsCollector.cs
@@ -39,9 +39,13 @@ public HostMetricsCollector(HostMetricsSettings settings)
 
             if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
             {
-                var useLegacyCollector = Environment.GetEnvironmentVariable(VostokSystemMetricsConstants.UseLegacyMetricsCollectorEnvironmentVariable) == "TRUE";
+                var useLegacyCollector = Environment
+                    .GetEnvironmentVariable(VostokSystemMetricsConstants.UseLegacyMetricsCollectorEnvironmentVariable)?
+                    .Equals("true", StringComparison.InvariantCultureIgnoreCase) ?? false;
                 INativeHostMetricsCollector_Linux collector = useLegacyCollector 
+#pragma warning disable CS0612
                     ? new LegacyNativeHostMetricsCollector_Linux(this.settings) 
+#pragma warning restore CS0612
                     : new NativeHostMetricsCollector_Linux(this.settings);
                 nativeCollector = collector.Collect;
                 disposeNativeCollector = collector.Dispose;
diff --git a/Vostok.Metrics.System/Host/Legacy/LegacyHostCpuUtilizationCollector.cs b/Vostok.Metrics.System/Host/Legacy/LegacyHostCpuUtilizationCollector.cs
index cc7abaf..1b34fec 100644
--- a/Vostok.Metrics.System/Host/Legacy/LegacyHostCpuUtilizationCollector.cs
+++ b/Vostok.Metrics.System/Host/Legacy/LegacyHostCpuUtilizationCollector.cs
@@ -3,6 +3,7 @@
 
 namespace Vostok.Metrics.System.Host.Legacy
 {
+    [Obsolete]
     internal class LegacyHostCpuUtilizationCollector
     {
         private readonly Func<int?> coresCountProvider;
diff --git a/Vostok.Metrics.System/Process/CurrentProcessMetricsCollector.cs b/Vostok.Metrics.System/Process/CurrentProcessMetricsCollector.cs
index 0e77833..a4c3030 100644
--- a/Vostok.Metrics.System/Process/CurrentProcessMetricsCollector.cs
+++ b/Vostok.Metrics.System/Process/CurrentProcessMetricsCollector.cs
@@ -91,9 +91,13 @@ public CurrentProcessMetricsCollector(CurrentProcessMetricsSettings settings)
 
             if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
             {
-                var useLegacyCollector = Environment.GetEnvironmentVariable(VostokSystemMetricsConstants.UseLegacyMetricsCollectorEnvironmentVariable) == "TRUE";
+                var useLegacyCollector = Environment
+                    .GetEnvironmentVariable(VostokSystemMetricsConstants.UseLegacyMetricsCollectorEnvironmentVariable)?
+                    .Equals("true", StringComparison.InvariantCultureIgnoreCase) ?? false;
                 INativeProcessMetricsCollector_Linux collector = useLegacyCollector
+#pragma warning disable CS0612
                     ? new LegacyNativeMetricsCollector_Linux() 
+#pragma warning restore CS0612
                     : new NativeProcessMetricsCollector_Linux(this.settings.LinuxSettings);
                 nativeCollector = collector.Collect;
                 disposeNativeCollector = collector.Dispose;
diff --git a/Vostok.Metrics.System/Process/INativeProcessMetricsCollector_Linux.cs b/Vostok.Metrics.System/Process/INativeProcessMetricsCollector_Linux.cs
index bc54941..12c2fb6 100644
--- a/Vostok.Metrics.System/Process/INativeProcessMetricsCollector_Linux.cs
+++ b/Vostok.Metrics.System/Process/INativeProcessMetricsCollector_Linux.cs
@@ -1,8 +1,9 @@
+using System;
+
 namespace Vostok.Metrics.System.Process;
 
 // ReSharper disable once InconsistentNaming
-internal interface INativeProcessMetricsCollector_Linux
+internal interface INativeProcessMetricsCollector_Linux : IDisposable
 {
     void Collect(CurrentProcessMetrics metrics);
-    void Dispose();
 }
\ No newline at end of file
diff --git a/Vostok.Metrics.System/Process/Legacy/LegacyCurrentProcessCpuUtilizationCollector.cs b/Vostok.Metrics.System/Process/Legacy/LegacyCurrentProcessCpuUtilizationCollector.cs
index 39624ef..8cbdf4d 100644
--- a/Vostok.Metrics.System/Process/Legacy/LegacyCurrentProcessCpuUtilizationCollector.cs
+++ b/Vostok.Metrics.System/Process/Legacy/LegacyCurrentProcessCpuUtilizationCollector.cs
@@ -3,6 +3,7 @@
 
 namespace Vostok.Metrics.System.Process.Legacy
 {
+    [Obsolete]
     internal class LegacyCpuUtilizationCollector
     {
         private static readonly int DefaultCoresCount = Environment.ProcessorCount;
diff --git a/Vostok.Metrics.System/Process/Legacy/LegacyNativeProcessMetricsCollector_Linux.cs b/Vostok.Metrics.System/Process/Legacy/LegacyNativeProcessMetricsCollector_Linux.cs
index bcb52d4..aea23d1 100644
--- a/Vostok.Metrics.System/Process/Legacy/LegacyNativeProcessMetricsCollector_Linux.cs
+++ b/Vostok.Metrics.System/Process/Legacy/LegacyNativeProcessMetricsCollector_Linux.cs
@@ -7,6 +7,7 @@
 
 namespace Vostok.Metrics.System.Process.Legacy
 {
+    [Obsolete]
     internal class LegacyNativeMetricsCollector_Linux : INativeProcessMetricsCollector_Linux
     {
         private const string cgroupMemoryLimitFileName = "/sys/fs/cgroup/memory/memory.limit_in_bytes";