db_ignore_replica() is deprecated and converted into a service.

db_ignore_replica() is deprecated and will be removed in Drupal 9.0.0.

Use \Drupal::service('database.replica_kill_switch')->trigger(); instead.

Controllers and services should inject the database.replica_kill_switch service and use the trigger() method

Before

  db_ignore_replica();

After

  $this->replicaKillSwitch->trigger();