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Are you worried about that endpoint being used for DoS or is it light enough?

The way i do it is running the checks in a background every x minutes and add the result in a json file. It’s fast and safe.

I'd guess you'd then also want to return a timestamp in the response and then fail if the timestamp is older than x minutes too

It's rate-limited and behind Cloudflare. But, the checks are like "can I connect to Redis", so it is pretty lightweight.