diff --git a/includes/libs/objectcache/README.md b/includes/libs/objectcache/README.md
index d8041748840..064878fbd09 100644
--- a/includes/libs/objectcache/README.md
+++ b/includes/libs/objectcache/README.md
@@ -14,11 +14,8 @@ statistics in entry points where MW_ENTRY_POINT is 'cli'.
 Upon cache access via `WANObjectCache::getWithSetCallback()`, this measures the total time spent
 in this method from start to end for all cases, except process-cache hits.
 
-See also subsets of this measure:
-
-* `wanobjectcache.{kClass}.regen_walltime`: If regenerated, just the portion of time to regenerate the value.
-* `wanobjectcache.{kClass}.regen_set_delay`: If regenerated and approved for storing, the time from start to right
-  before storing.
+See also `wanobjectcache.{kClass}.regen_walltime`, which, during misses/renews, measures just the
+portion of time spent in the callback to regenerate the value.
 
 * Type: Measure (in milliseconds).
 * Variable `kClass`: The first part of your cache key.
@@ -52,19 +49,6 @@ the regeneration callback when computing a new value.
 * Type: Measure (in milliseconds).
 * Variable `kClass`: The first part of your cache key.
 
-#### `wanobjectcache.{kClass}.regen_set_delay`
-
-Upon cache update due to a cache miss or async refresh, this measures the time spent in
-`WANObjectCache::getWithSetCallback()`, from the start of the method to right after
-the new value has been computed by the callback.
-
-This essentially measures the whole method (including retrieval of any old value,
-validation, any regeneration locks, and the callback), except for the time spent
-in sending the value to the backend store.
-
-* Type: Measure (in milliseconds).
-* Variable `kClass`: The first part of your cache key.
-
 #### `wanobjectcache.{kClass}.ck_touch.{result}`
 
 Call counter from `WANObjectCache::touchCheckKey()`.
diff --git a/includes/libs/objectcache/WANObjectCache.php b/includes/libs/objectcache/WANObjectCache.php
index 4d3b4998ac2..e624022a2ce 100644
--- a/includes/libs/objectcache/WANObjectCache.php
+++ b/includes/libs/objectcache/WANObjectCache.php
@@ -1811,9 +1811,6 @@ class WANObjectCache implements
 		}
 		$postCallbackTime = $this->getCurrentTime();
 
-		// How long it took to fetch, validate, and generate the value
-		$elapsed = max( $postCallbackTime - $startTime, 0.0 );
-
 		// How long it took to generate the value
 		$walltime = max( $postCallbackTime - $preCallbackTime, 0.0 );
 
@@ -1829,11 +1826,6 @@ class WANObjectCache implements
 			// Current thread was not raced out of a regeneration lock or key is tombstoned
 			( !$useRegenerationLock || $hasLock || $isKeyTombstoned )
 		) {
-			$this->stats->getTiming( 'wanobjectcache_regen_set_delay_seconds' )
-				->setLabel( 'keygroup', $keygroup )
-				->copyToStatsdAt( "wanobjectcache.$keygroup.regen_set_delay" )
-				->observe( 1e3 * $elapsed );
-
 			// If the key is write-holed then use the (volatile) interim key as an alternative
 			if ( $isKeyTombstoned ) {
 				$this->setInterimValue(