Index: src/wp-includes/class-wp-site.php
===================================================================
--- src/wp-includes/class-wp-site.php	(revision 38929)
+++ src/wp-includes/class-wp-site.php	(working copy)
@@ -346,6 +346,9 @@
 			}
 		}
 
+		/** This filter is documented in wp-includes/ms-blogs.php */
+		$details = apply_filters_deprecated( 'blog_details', array( $details ), '4.7.0', 'site_details' );
+
 		/**
 		 * Filters a site's extended properties.
 		 *
Index: src/wp-includes/ms-blogs.php
===================================================================
--- src/wp-includes/ms-blogs.php	(revision 38929)
+++ src/wp-includes/ms-blogs.php	(working copy)
@@ -240,10 +240,11 @@
 	 * Filters a blog's details.
 	 *
 	 * @since MU
+	 * @deprecated 4.7.0 Use site_details
 	 *
 	 * @param object $details The blog details.
 	 */
-	$details = apply_filters( 'blog_details', $details );
+	$details = apply_filters_deprecated( 'blog_details', array( $details ), '4.7.0', 'site_details' );
 
 	wp_cache_set( $blog_id . $all, $details, 'blog-details' );