ICU-22142 Deprecate ICU4C createMetricTon/getMetricTon, ICU4J METRIC_TON

Author: pedberg-icu

icu4c/source/i18n/unicode/measunit.h

@@ -2847,29 +2847,25 @@ class U_I18N_API MeasureUnit: public UObject {
      */
     static MeasureUnit getTonne();
 
+#ifndef U_HIDE_DEPRECATED_API
     /**
      * Returns by pointer, unit of mass: metric-ton
      * (renamed to tonne in CLDR 42 / ICU 72).
      * Caller owns returned value and must free it.
-     * Note: In ICU 74 this will be deprecated in favor of
-     * createTonne(), which is currently draft but will
-     * become stable in ICU 74, and which uses the preferred naming.
      * Also see {@link #getMetricTon()} and {@link #createTonne()}.
      * @param status ICU error code.
-     * @stable ICU 54
+     * @deprecated ICU 78 use createTonne(UErrorCode &status)
      */
     static MeasureUnit *createMetricTon(UErrorCode &status);
 
     /**
      * Returns by value, unit of mass: metric-ton
      * (renamed to tonne in CLDR 42 / ICU 72).
-     * Note: In ICU 74 this will be deprecated in favor of
-     * getTonne(), which is currently draft but will
-     * become stable in ICU 74, and which uses the preferred naming.
      * Also see {@link #createMetricTon()} and {@link #getTonne()}.
-     * @stable ICU 64
+     * @deprecated ICU 78 use getTonne()
      */
     static MeasureUnit getMetricTon();
+#endif  /* U_HIDE_DEPRECATED_API */
 
     /**
      * Returns by pointer, unit of power: gigawatt.

icu4j/main/core/src/main/java/com/ibm/icu/util/MeasureUnit.java

@@ -1776,10 +1776,10 @@ protected synchronized static MeasureUnit addUnit(String type, String unitName,
 
     /**
      * Constant for unit of mass: metric-ton (renamed to tonne in CLDR 42 / ICU 72).
-     * Note: In ICU 74 this will be deprecated in favor of TONNE, which is currently
-     * draft but will become stable in ICU 74, and which uses the preferred naming.
-     * @stable ICU 54
+     * @internal
+     * @deprecated This API is ICU internal only.
      */
+    @Deprecated
     public static final MeasureUnit METRIC_TON = MeasureUnit.internalGetInstance("mass", "tonne");
 
     /**