Clarify reason for deprecating autotime properties

Closes gh-41745

Author: snicoll

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/resources/META-INF/additional-spring-configuration-metadata.json

@@ -1936,15 +1936,15 @@
       "defaultValue": true,
       "deprecation": {
         "level": "error",
-        "reason": "Should be applied at the ObservationRegistry level."
+        "reason": "Requests are timed automatically."
       }
     },
     {
       "name": "management.metrics.graphql.autotime.percentiles",
       "description": "Computed non-aggregable percentiles to publish.",
       "deprecation": {
         "level": "error",
-        "reason": "Should be applied at the ObservationRegistry level."
+        "reason": "Should be configured globally via management.metrics.distribution.percentiles."
       }
     },
     {
@@ -1953,7 +1953,7 @@
       "defaultValue": false,
       "deprecation": {
         "level": "error",
-        "reason": "Should be applied at the ObservationRegistry level."
+        "reason": "Should be configured globally via management.metrics.distribution.percentiles-histogram."
       }
     },
     {
@@ -1979,15 +1979,15 @@
       "defaultValue": true,
       "deprecation": {
         "level": "error",
-        "reason": "Should be applied at the ObservationRegistry level."
+        "reason": "Requests are timed automatically."
       }
     },
     {
       "name": "management.metrics.web.client.request.autotime.percentiles",
       "description": "Computed non-aggregable percentiles to publish.",
       "deprecation": {
         "level": "error",
-        "reason": "Should be applied at the ObservationRegistry level."
+        "reason": "Should be configured globally via management.metrics.distribution.percentiles."
       }
     },
     {
@@ -1996,7 +1996,7 @@
       "defaultValue": false,
       "deprecation": {
         "level": "error",
-        "reason": "Should be applied at the ObservationRegistry level."
+        "reason": "Should be configured globally via management.metrics.distribution.percentiles-histogram."
       }
     },
     {
@@ -2029,15 +2029,15 @@
       "defaultValue": true,
       "deprecation": {
         "level": "error",
-        "reason": "Should be applied at the ObservationRegistry level."
+        "reason": "Requests are timed automatically."
       }
     },
     {
       "name": "management.metrics.web.server.request.autotime.percentiles",
       "description": "Computed non-aggregable percentiles to publish.",
       "deprecation": {
         "level": "error",
-        "reason": "Should be applied at the ObservationRegistry level."
+        "reason": "Should be configured globally via management.metrics.distribution.percentiles."
       }
     },
     {
@@ -2046,7 +2046,7 @@
       "defaultValue": false,
       "deprecation": {
         "level": "error",
-        "reason": "Should be applied at the ObservationRegistry level."
+        "reason": "Should be configured globally via management.metrics.distribution.percentiles-histogram."
       }
     },
     {