Sidekiq MemoryKiller sends a `SIGKILL` signal, not `SIGTERM`
As documented in https://gitlab.com/gitlab-org/gitlab-ce/blob/f127edd012bd8b6f76ac67d69aadbd7d4837258f/lib/gitlab/sidekiq_middleware/memory_killer.rb#L10 (this was changed by c291ff9c).
As documented in https://gitlab.com/gitlab-org/gitlab-ce/blob/f127edd012bd8b6f76ac67d69aadbd7d4837258f/lib/gitlab/sidekiq_middleware/memory_killer.rb#L10 (this was changed by c291ff9c).