plugin topology update operation needs to be a struct

The following discussion from !984 (merged) should be addressed:

• @gmoshkin started a discussion:

  надо это в структуру выносить, это уже совсем плохо

added 1 deleted label

assigned to @k.derevtsov

changed title from flaky test test_instance_service_poison_and_healthy_then to plugin topology update operation needs to be a struct

mentioned in commit f559b308

closed

mentioned in commit d6d59362