diff --git a/solr/core/src/java/org/apache/solr/util/tracing/SimplePropagator.java b/solr/core/src/java/org/apache/solr/util/tracing/SimplePropagator.java
index a626e55f7078..6e0fc91179c1 100644
--- a/solr/core/src/java/org/apache/solr/util/tracing/SimplePropagator.java
+++ b/solr/core/src/java/org/apache/solr/util/tracing/SimplePropagator.java
@@ -21,14 +21,11 @@
 import io.opentelemetry.context.propagation.TextMapGetter;
 import io.opentelemetry.context.propagation.TextMapPropagator;
 import io.opentelemetry.context.propagation.TextMapSetter;
-import java.lang.invoke.MethodHandles;
 import java.util.Collection;
 import java.util.List;
 import java.util.concurrent.atomic.AtomicLong;
 import org.apache.solr.common.util.EnvUtils;
 import org.apache.solr.logging.MDCLoggingContext;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 /**
  * Simple Http Header Propagator. When enabled, this will only propagate the trace id from the
@@ -39,10 +36,9 @@
  * replacing/upgrading once that becomes generally available
  */
 public class SimplePropagator implements TextMapPropagator {
-  private static final Logger log = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
 
   private static final String TRACE_HOST_NAME =
-      EnvUtils.getProperty("solr.traceHostName", EnvUtils.getProperty("host"));
+      EnvUtils.getProperty("solr.traceHostName", EnvUtils.getProperty("solr.host.advertise"));
   private static final TextMapPropagator INSTANCE = new SimplePropagator();
   private static final ContextKey<String> TRACE_ID_KEY = ContextKey.named("trace_id");
 
diff --git a/solr/modules/opentelemetry/src/java/org/apache/solr/opentelemetry/OtelTracerConfigurator.java b/solr/modules/opentelemetry/src/java/org/apache/solr/opentelemetry/OtelTracerConfigurator.java
index ae1aa625991c..d3cb53f5f74c 100644
--- a/solr/modules/opentelemetry/src/java/org/apache/solr/opentelemetry/OtelTracerConfigurator.java
+++ b/solr/modules/opentelemetry/src/java/org/apache/solr/opentelemetry/OtelTracerConfigurator.java
@@ -74,8 +74,8 @@ void prepareConfiguration(NamedList<?> args) {
     setDefaultIfNotConfigured("OTEL_EXPORTER_OTLP_PROTOCOL", "http/protobuf");
     setDefaultIfNotConfigured("OTEL_TRACES_SAMPLER", "parentbased_always_on");
     setDefaultIfNotConfigured("OTEL_PROPAGATORS", "tracecontext,baggage");
-    if (EnvUtils.getProperty("host") != null) {
-      addOtelResourceAttributes(Map.of("host.name", EnvUtils.getProperty("host")));
+    if (EnvUtils.getProperty("solr.host.advertise") != null) {
+      addOtelResourceAttributes(Map.of("host.name", EnvUtils.getProperty("solr.host.advertise")));
     }
 
     final String currentConfig = getCurrentOtelConfigAsString();
diff --git a/solr/modules/opentelemetry/src/test/org/apache/solr/opentelemetry/OtelTracerConfiguratorTest.java b/solr/modules/opentelemetry/src/test/org/apache/solr/opentelemetry/OtelTracerConfiguratorTest.java
index a1cfc7bf10d9..0818e9961a5d 100644
--- a/solr/modules/opentelemetry/src/test/org/apache/solr/opentelemetry/OtelTracerConfiguratorTest.java
+++ b/solr/modules/opentelemetry/src/test/org/apache/solr/opentelemetry/OtelTracerConfiguratorTest.java
@@ -39,7 +39,7 @@ public void setUp() throws Exception {
     System.setProperty("otelnothere", "bar");
     System.setProperty("otel.k1", "prop-k1");
     System.setProperty("otel.k3", "prop-k3");
-    System.setProperty("host", "my.solr.host");
+    System.setProperty("solr.host.advertise", "my.solr.host");
     instance = new OtelTracerConfigurator(currentEnv);
   }
 
diff --git a/solr/solrj/src/resources/EnvToSyspropMappings.properties b/solr/solrj/src/resources/EnvToSyspropMappings.properties
index 176bccf7a136..61fabd7ea8f7 100644
--- a/solr/solrj/src/resources/EnvToSyspropMappings.properties
+++ b/solr/solrj/src/resources/EnvToSyspropMappings.properties
@@ -1,17 +1,18 @@
 # Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements; and to You under the Apache License, Version 2.0.
 #
-# Mapping from Environment variable to system property
-# This file only contains non-standard mappings that do not follow the standard naming convention
-# Map to nothing to avoid setting any system property for the env.variable
-# CamelCase properties are mapped to dot separated lowercase
-# This way, env SOLR_FOO_BAR will also match property 'solr.foo.bar' without a mapping in this file
-# TODO: Deprecate non-standard sysprops and standardize on solr.foo.bar in Solr 10
+# Mapping from Environment variable to system property.
+# This file only contains non-standard mappings that do not follow the standard naming convention.
+# Map to nothing to avoid setting any system property for the env.variable.
+# Env var names are mapped to sys props by lowercasing and replacing '_' with '.', so
+# SOLR_FOO_BAR will match property 'solr.foo.bar' without needing a mapping in this file.
+# Separately, sysprop lookups (EnvUtils.getProperty) also fall back from camelCase to
+# dot-separated form (e.g. 'solr.logLevel' <-> 'solr.log.level'), independent of this file.
+# TODO: Deprecate non-standard sysprops and standardize on solr.foo.bar.
 AWS_PROFILE=aws.profile
-SOLR_ALWAYS_ON_TRACE_ID=solr.alwaysOnTraceId
-SOLR_AUTH_JWT_ALLOW_OUTBOUND_HTTP=solr.auth.jwt.allowOutboundHttp
-SOLR_HIDDEN_SYS_PROPS=solr.hiddenSysProps
+SOLR_ALWAYS_ON_TRACE_ID=solr.tracing.always.on.enabled
+SOLR_AUTH_JWT_ALLOW_OUTBOUND_HTTP=solr.auth.jwt.outbound.http.enabled
+SOLR_HIDDEN_SYS_PROPS=solr.responses.hidden.sys.props
 SOLR_HOME=solr.solr.home
-SOLR_HOST_ADVERTISE=host
 SOLR_HTTP_DISABLE_COOKIES=solr.http.disableCookies
 # Couldn't we just use solr.ip.allowlist everywhere instead of solr.jetty.inetaccess.includes?
 SOLR_IP_ALLOWLIST=solr.jetty.inetaccess.includes
@@ -20,8 +21,8 @@ SOLR_OTEL_DEFAULT_CONFIGURATOR=solr.otelDefaultConfigurator
 SOLR_TIMEZONE=user.timezone
 SOLR_TIP=solr.install.dir
 SOLR_TIP_SYM=solr.install.symDir
-ZK_CLIENT_TIMEOUT=zkClientTimeout
-ZK_CREATE_CHROOT=createZkChroot
+ZK_CLIENT_TIMEOUT=solr.zookeeper.client.timeout
+ZK_CREATE_CHROOT=solr.zookeeper.chroot.create
 ZK_CREDENTIALS_INJECTOR=zkCredentialsInjector
 ZK_CREDENTIALS_PROVIDER=zkCredentialsProvider
 ZK_DIGEST=PASSWORD=zkDigestPassword
@@ -32,8 +33,8 @@ ZK_DIGEST_USERNAME=zkDigestUsername
 ZK_HOST=zkHost
 
 # Commonly used in solr.xml
-SOLR_ALLOW_PATHS=solr.allowPaths
-SOLR_ALLOW_URLS=solr.allowUrls
+SOLR_ALLOW_PATHS=solr.security.allow.paths
+SOLR_ALLOW_URLS=solr.security.allow.urls
 SOLR_MAX_BOOLEAN_CLAUSES=solr.max.booleanClauses
 SOLR_METRICS_ENABLED=metricsEnabled
 SOLR_SHARED_LIB=solr.sharedLib
diff --git a/solr/solrj/src/test/org/apache/solr/common/util/EnvUtilsTest.java b/solr/solrj/src/test/org/apache/solr/common/util/EnvUtilsTest.java
index 346aee08b424..0ca364050fb3 100644
--- a/solr/solrj/src/test/org/apache/solr/common/util/EnvUtilsTest.java
+++ b/solr/solrj/src/test/org/apache/solr/common/util/EnvUtilsTest.java
@@ -17,10 +17,16 @@
 
 package org.apache.solr.common.util;
 
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.nio.charset.StandardCharsets;
 import java.util.List;
 import java.util.Map;
 import java.util.Properties;
+import java.util.regex.Pattern;
+import java.util.stream.Collectors;
 import org.apache.solr.SolrTestCase;
+import org.apache.solr.util.LogListener;
 import org.junit.BeforeClass;
 import org.junit.Test;
 
@@ -71,15 +77,14 @@ public void getPropWithCamelCase() {
     assertEquals("INFO", EnvUtils.getProperty("solr.logLevel"));
     assertEquals("INFO", EnvUtils.getProperty("solr.LogLevel"));
     assertEquals(Long.valueOf(1234567890L), EnvUtils.getPropertyAsLong("solrLong"));
-    assertEquals(Boolean.TRUE, EnvUtils.getPropertyAsBool("solr.alwaysOnTraceId"));
-    assertEquals(Boolean.TRUE, EnvUtils.getPropertyAsBool("solr.always.on.trace.id"));
+    assertEquals(Boolean.TRUE, EnvUtils.getPropertyAsBool("solr.tracing.always.on.enabled"));
   }
 
   @Test
   public void testEnvsWithCustomKeyNameMappings() {
     // These have different names than the environment variables
     assertEquals(ENV.get("SOLR_HOME"), EnvUtils.getProperty("solr.solr.home"));
-    assertEquals(ENV.get("SOLR_HOST_ADVERTISE"), EnvUtils.getProperty("host"));
+    assertEquals(ENV.get("SOLR_HOST_ADVERTISE"), EnvUtils.getProperty("solr.host.advertise"));
     assertEquals(ENV.get("SOLR_LOGS_DIR"), EnvUtils.getProperty("solr.logs.dir"));
   }
 
@@ -143,4 +148,91 @@ public void testFlippingDisabledToEnabledPropertyName() {
     EnvUtils.init(false, env, defaultProps);
     assertEquals(false, EnvUtils.getPropertyAsBool("solr.ui.enabled"));
   }
+
+  /**
+   * These env vars must map directly to their current sysprop name, not to a legacy/intermediate
+   * name that DeprecatedSystemPropertyMappings.properties also treats as deprecated -- otherwise
+   * EnvUtils' own deprecation-forwarding logic trips on itself and logs a confusing warning, even
+   * though the value still resolves correctly via that indirection. A value-only assertion wouldn't
+   * catch a regression here, since the value resolves fine either way -- the warning is the actual
+   * symptom, so this asserts on both.
+   *
+   * <p>SOLR_ALWAYS_ON_TRACE_ID is the same pattern (see {@link #getPropWithCamelCase}) but is
+   * deliberately excluded here: it shares a target sysprop with that other test, and this test
+   * would clobber it with a non-boolean value depending on random test execution order.
+   *
+   * <p>The LogListener is scoped to only these six properties' names (rather than listening for
+   * *any* WARN from EnvUtils) because {@code init()} is called here with the real, live {@code
+   * System.getProperties()} -- its deprecated-property-forwarding loop rescans *all* current system
+   * properties every time, so leftover deprecated markers set by unrelated tests earlier in this
+   * same suite/JVM (e.g. {@link #testFlippingDisabledToEnabledPropertyName}) would otherwise be
+   * re-detected and re-warned-about here too, causing flaky, unrelated failures.
+   */
+  @Test
+  public void envToSyspropMappingsDoNotTriggerDeprecationWarnings() {
+    var envVarToExpectedSysprop =
+        Map.of(
+            "ZK_CLIENT_TIMEOUT", "solr.zookeeper.client.timeout",
+            "ZK_CREATE_CHROOT", "solr.zookeeper.chroot.create",
+            "SOLR_AUTH_JWT_ALLOW_OUTBOUND_HTTP", "solr.auth.jwt.outbound.http.enabled",
+            "SOLR_HIDDEN_SYS_PROPS", "solr.responses.hidden.sys.props",
+            "SOLR_ALLOW_PATHS", "solr.security.allow.paths",
+            "SOLR_ALLOW_URLS", "solr.security.allow.urls");
+    var onlyOurTargets =
+        Pattern.compile(
+            envVarToExpectedSysprop.values().stream()
+                .map(Pattern::quote)
+                .collect(Collectors.joining("|")));
+
+    try (LogListener warnLog = LogListener.warn(EnvUtils.class).regex(onlyOurTargets)) {
+      for (var entry : envVarToExpectedSysprop.entrySet()) {
+        EnvUtils.init(true, Map.of(entry.getKey(), entry.getKey()), System.getProperties());
+        assertEquals(
+            "env var " + entry.getKey() + " should map to " + entry.getValue(),
+            entry.getKey(),
+            EnvUtils.getProperty(entry.getValue()));
+      }
+      assertEquals(
+          "No deprecated-property warnings should be logged for these mappings",
+          0,
+          warnLog.getCount());
+    }
+  }
+
+  @Test
+  public void envToSyspropMappingsDoNotMapToDeprecatedSystemProperties() throws IOException {
+    Properties envMappings = loadProperties("EnvToSyspropMappings.properties");
+    Properties deprecatedMappings = loadProperties("DeprecatedSystemPropertyMappings.properties");
+    Map<String, String> reverseDeprecatedMappings =
+        deprecatedMappings.entrySet().stream()
+            .collect(Collectors.toMap(e -> (String) e.getValue(), e -> (String) e.getKey()));
+
+    for (String envVar : envMappings.stringPropertyNames()) {
+      String sysProp = envMappings.getProperty(envVar);
+      String newSysProp = reverseDeprecatedMappings.get(sysProp);
+      if (newSysProp != null) {
+        fail(
+            "expected <"
+                + sysProp
+                + "> "
+                + "mapped from <"
+                + envVar
+                + "> to not be deprecated, "
+                + "but it was replaced by <"
+                + newSysProp
+                + ">");
+      }
+    }
+  }
+
+  private static Properties loadProperties(String resourceName) throws IOException {
+    Properties properties = new Properties();
+    try (var resource =
+        new InputStreamReader(
+            EnvUtils.class.getClassLoader().getResourceAsStream(resourceName),
+            StandardCharsets.UTF_8)) {
+      properties.load(resource);
+    }
+    return properties;
+  }
 }