grid_stats: consolidate thread stats for custom stats

src/cats/stats/grid_stats.c

@@ -143,6 +143,10 @@ void consolidate_thread_stats(struct cats_grid *grid, struct cats_configuration
                         for (int32_t stat_idx = STAT_MIN; stat_idx < STAT_MAX; stat_idx++) {
                                 g->stats.stats[stat_idx] += threads[i].stats[class].stats[stat_idx];
                         }
+
+                        for (int64_t j = 0; j < threads[i].stats->custom_stat_count; j++){
+                                g->stats.custom_stats[j] += threads[i].stats[class].custom_stats[j];
+                        }
                 }
         }
 }