diff --git a/fuchsia/session_framework/metrics.yaml b/fuchsia/session_framework/metrics.yaml
index a3a1d5e..9a4239d 100644
--- a/fuchsia/session_framework/metrics.yaml
+++ b/fuchsia/session_framework/metrics.yaml
@@ -15,11 +15,12 @@
 # a child session component. Each time a session is launched, we log its launch time in
 # microseconds together with the launch's success status and the URL of the session.
 #########################################################################################
-- id: 1
-  replacement_metric_id: 101
-  metric_name: session_launch_time
-  metric_type: ELAPSED_TIME
-  metric_dimensions: &slt_dimensions
+- id: 101
+  metric_name: session_launch_time_migrated
+  metric_type: INTEGER
+  metric_units: MICROSECONDS
+  metric_semantics: [LATENCY]
+  metric_dimensions:
     # What was the status of the launch?
     - dimension: status
       event_codes:
@@ -34,27 +35,6 @@
     # of that session, for each day.
     #########################################################################################
     - report_name: session_launch_time_stats
-      id: 2574629561 # legacy long report_id
-      report_type: NUMERIC_AGGREGATION
-      system_profile_field: [BOARD_NAME, PRODUCT_NAME, SYSTEM_VERSION, CHANNEL]
-  meta_data:
-    max_release_stage: GA
-    expiration_date: "2022/01/07"
-
-- id: 101
-  metric_name: session_launch_time_migrated
-  metric_type: INTEGER
-  metric_units: MICROSECONDS
-  metric_semantics: [LATENCY]
-  metric_dimensions: *slt_dimensions
-  reports:
-    #########################################################################################
-    # session_launch_time_stats
-    #
-    # Statistics of the launch time of each session, across all launches
-    # of that session, for each day.
-    #########################################################################################
-    - report_name: session_launch_time_stats
       id: 1
       report_type: FLEETWIDE_MEANS
       privacy_level: NO_ADDED_PRIVACY
@@ -70,36 +50,16 @@
 # a child element component. Each time an element is launched, we log its launch time in
 # microseconds together with the launch's success status and the URL of the element.
 #########################################################################################
-- id: 2
-  replacement_metric_id: 102
-  metric_name: element_launch_time
-  metric_type: ELAPSED_TIME
-  metric_dimensions: &elt_dimensions
+- id: 102
+  metric_name: element_launch_time_migrated
+  metric_type: INTEGER
+  metric_dimensions:
     # What was the status of the launch?
     - dimension: status
       event_codes:
         0: Success
         1: Failure
       max_event_code: 50
-  reports:
-    #########################################################################################
-    # element_launch_time_stats
-    #
-    # Statistics of the launch time of each element, across all launches
-    # of that element, for each day.
-    #########################################################################################
-    - report_name: element_launch_time_stats
-      id: 3858855329 # legacy long report_id
-      report_type: NUMERIC_AGGREGATION
-      system_profile_field: [BOARD_NAME, PRODUCT_NAME, SYSTEM_VERSION, CHANNEL]
-  meta_data:
-    max_release_stage: GA
-    expiration_date: "2022/01/07"
-
-- id: 102
-  metric_name: element_launch_time_migrated
-  metric_type: INTEGER
-  metric_dimensions: *elt_dimensions
   metric_units: MICROSECONDS
   metric_semantics: [LATENCY]
   reports:
@@ -117,3 +77,6 @@
   meta_data:
     max_release_stage: GA
     expiration_date: "2022/01/07"
+
+# Deleted metric IDs that must not be reused.
+deleted_metric_ids: [1,2]