1 files changed, 14 insertions, 0 deletions
diff --git a/src/System.Private.CoreLib/shared/System/Buffers/ArrayPoolEventSource.cs b/src/System.Private.CoreLib/shared/System/Buffers/ArrayPoolEventSource.cs
index b2d0dbd32..d0563c497 100644
--- a/src/System.Private.CoreLib/shared/System/Buffers/ArrayPoolEventSource.cs
+++ b/src/System.Private.CoreLib/shared/System/Buffers/ArrayPoolEventSource.cs
@@ -86,5 +86,19 @@ namespace System.Buffers
         /// </summary>
         [Event(3, Level = EventLevel.Verbose)]
         internal void BufferReturned(int bufferId, int bufferSize, int poolId) => WriteEvent(3, bufferId, bufferSize, poolId);
+
+        /// <summary>
+        /// Event raised when we attempt to free a buffer due to inactivity or memory pressure (by no longer
+        /// referencing it). It is possible (although not commmon) this buffer could be rented as we attempt
+        /// to free it. A rent event before or after this event for the same ID, is a rare, but expected case.
+        /// </summary>
+        [Event(4, Level = EventLevel.Informational)]
+        internal void BufferTrimmed(int bufferId, int bufferSize, int poolId) => WriteEvent(4, bufferId, bufferSize, poolId);
+
+        /// <summary>
+        /// Event raised when we check to trim buffers.
+        /// </summary>
+        [Event(5, Level = EventLevel.Informational)]
+        internal void BufferTrimPoll(int milliseconds, int pressure) => WriteEvent(5, milliseconds, pressure);
     }
 }