added obsolte to the adapter as well

src/Sentry/Extensibility/HubAdapter.cs

@@ -288,6 +288,9 @@ public Task FlushAsync(TimeSpan timeout)
         => SentrySdk.FlushAsync(timeout);
 
     /// <inheritdoc cref="IMetricAggregator"/>
+    [Obsolete("The SentrySdk.Metrics module is deprecated and will be removed in the next major release. " +
+              "Sentry will reject all metrics sent after October 7, 2024." +
+              "Learn more: https://sentry.zendesk.com/hc/en-us/articles/26369339769883-Upcoming-API-Changes-to-Metrics")]
     public IMetricAggregator Metrics
         => SentrySdk.Metrics;