Hello, I’m using the 0.165 version of the n8n service as an open source.
Thank you in advance for your reply.
Hi @Hakyoung, welcome to the community 
What product should I use to receive it by slack or e-mail when the workflow becomes error or unkown? basic or pro?
This shouldn’t matter. You can create error workflows on all editions of n8n, whether that’s the free community edition or any of our paid plans.
I’m using Self-hosting now, but when I execute about 200 times per minute, n8n is stopped because of OOM. Can I avoid OOM by using cloud?
Chances are n8n cloud would be affected as well as it provides less memory than most self-hosted environments. You can check out Azure | n8n Docs for the exact specs.
If you are receiving 200 incoming webhooks per minute causing the OOM situations, you could consider using something like https://hookdeck.com/ in front of n8n. Such a service can handle a large number of webhooks at once and can then throttle them before passing each individual request on to n8n and thus help dealing with sudden spikes.
General information on how to deal with this kind of issues is also available in our docs at Memory-related errors | n8n Docs
Last but not least, you might want to consider upgrading your n8n version at some point. A lot of improvements have gone into the product since 0.165. n8n v1.0 migration guide | n8n Docs has a comprehensive guide on how to approach this.
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