diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index 87ea8f0c9e8..14435a7242f 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -487,9 +487,9 @@ opentelemetry-exporter-sender-okhttp = { module = "io.opentelemetry:opentelemetr
 opentelemetry-runtime-telemetry = { module = "io.opentelemetry.instrumentation:opentelemetry-runtime-telemetry-java17", version.ref = "opentelemetry-runtime-telemetry" }
 opentelemetry-sdk = { module = "io.opentelemetry:opentelemetry-sdk", version.ref = "opentelemetry" }
 opentelemetry-sdk-extension-autoconfigure = { module = "io.opentelemetry:opentelemetry-sdk-extension-autoconfigure", version.ref = "opentelemetry" }
+opentelemetry-sdk-metrics = { module = "io.opentelemetry:opentelemetry-sdk-metrics", version.ref = "opentelemetry" }
 opentelemetry-sdk-testing = { module = "io.opentelemetry:opentelemetry-sdk-testing", version.ref = "opentelemetry" }
 opentelemetry-sdk-trace = { module = "io.opentelemetry:opentelemetry-sdk-trace", version.ref = "opentelemetry" }
-opentelemetry-sdk-metrics = { module = "io.opentelemetry:opentelemetry-sdk-metrics", version.ref = "opentelemetry" }
 osgi-annotation = { module = "org.osgi:osgi.annotation", version.ref = "osgi-annotation" }
 oshai-logging = { module = "io.github.oshai:kotlin-logging", version.ref = "oshai-logging" }
 # @keep transitive dependency for version alignment
diff --git a/solr/CHANGES.txt b/solr/CHANGES.txt
index 4316e788575..1337991ee21 100644
--- a/solr/CHANGES.txt
+++ b/solr/CHANGES.txt
@@ -327,6 +327,8 @@ Other Changes
 * SOLR-17879: A Solr node will now fail to start if it's major.minor version (e.g. 9.10) is *lower* than that of any existing
   Solr node in a SolrCloud cluster (as reported by info in "live_node").  (David Smiley)
 
+* SOLR-17956: XLSXResponseWriter has been deprecated and will be removed in a future release. (Jan Høydahl)
+
 * SOLR-17952: Stream decorator test refactoring - use underscore rather than dot in aliases (Andy Webb)
 
 ==================  9.9.1 ==================
diff --git a/solr/modules/extraction/src/java/org/apache/solr/handler/extraction/XLSXResponseWriter.java b/solr/modules/extraction/src/java/org/apache/solr/handler/extraction/XLSXResponseWriter.java
index c2f9f836761..ac8e6c54960 100644
--- a/solr/modules/extraction/src/java/org/apache/solr/handler/extraction/XLSXResponseWriter.java
+++ b/solr/modules/extraction/src/java/org/apache/solr/handler/extraction/XLSXResponseWriter.java
@@ -48,7 +48,12 @@
 import org.apache.solr.schema.StrField;
 import org.apache.solr.search.ReturnFields;
 
-/** A .XLSX spreadsheet format {@link org.apache.solr.response.QueryResponseWriter}. */
+/**
+ * A .XLSX spreadsheet format {@link org.apache.solr.response.QueryResponseWriter}.
+ *
+ * @deprecated This class will be removed in a future release.
+ */
+@Deprecated(since = "9.10", forRemoval = true)
 public class XLSXResponseWriter implements QueryResponseWriter {
 
   @Override
diff --git a/solr/modules/extraction/src/test/org/apache/solr/handler/extraction/TestXLSXResponseWriter.java b/solr/modules/extraction/src/test/org/apache/solr/handler/extraction/TestXLSXResponseWriter.java
index 42e9825ad7c..8eca2b0105c 100644
--- a/solr/modules/extraction/src/test/org/apache/solr/handler/extraction/TestXLSXResponseWriter.java
+++ b/solr/modules/extraction/src/test/org/apache/solr/handler/extraction/TestXLSXResponseWriter.java
@@ -42,7 +42,7 @@
 
 public class TestXLSXResponseWriter extends SolrTestCaseJ4 {
 
-  private static XLSXResponseWriter writerXlsx;
+  private static QueryResponseWriter writerXlsx;
 
   @BeforeClass
   public static void beforeClass() throws Exception {
@@ -52,8 +52,8 @@ public static void beforeClass() throws Exception {
     // find a reference to the default response writer so we can redirect its output later
     SolrCore testCore = h.getCore();
     QueryResponseWriter writer = testCore.getQueryResponseWriter("xlsx");
-    if (writer instanceof XLSXResponseWriter) {
-      writerXlsx = (XLSXResponseWriter) testCore.getQueryResponseWriter("xlsx");
+    if (writer != null) {
+      writerXlsx = writer;
     } else {
       throw new Exception("XLSXResponseWriter not registered with solr core");
     }
diff --git a/solr/solr-ref-guide/modules/query-guide/pages/response-writers.adoc b/solr/solr-ref-guide/modules/query-guide/pages/response-writers.adoc
index 84e938da5fb..ac86adbbceb 100644
--- a/solr/solr-ref-guide/modules/query-guide/pages/response-writers.adoc
+++ b/solr/solr-ref-guide/modules/query-guide/pages/response-writers.adoc
@@ -404,3 +404,8 @@ cp modules/extraction/lib/*.jar server/solr-webapp/webapp/WEB-INF/lib/
 ----
 
 Once the libraries are in place, you can add `wt=xlsx` to your request, and results will be returned as an XLSX sheet.
+
+[IMPORTANT]
+====
+The `XLSXResponseWriter` is deprecated and will be removed in a future release.
+====
diff --git a/solr/solr-ref-guide/modules/upgrade-notes/pages/major-changes-in-solr-9.adoc b/solr/solr-ref-guide/modules/upgrade-notes/pages/major-changes-in-solr-9.adoc
index 4217318491b..a54aceb624b 100644
--- a/solr/solr-ref-guide/modules/upgrade-notes/pages/major-changes-in-solr-9.adoc
+++ b/solr/solr-ref-guide/modules/upgrade-notes/pages/major-changes-in-solr-9.adoc
@@ -78,6 +78,10 @@ SolrJ users not using SolrClients that use Jetty HttpClient can safely exclude t
 
 Java has removed support for the Security Manager starting with Java 24; therefore, Solr will disable this feature when run with Java 24 or later. Solr previously used the Security Manager to provide an additional layer of protection against unintended file system access, network access, and process execution. Users upgrading to Java 24 or later should review their security practices and consider alternative measures, such as running Solr in containers or implementing additional operating system-level controls.
 
+=== Deprecations
+
+The `XLSXResponseWriter` is now deprecated.
+
 == Solr 9.9
 
 === SolrJ