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Can OpenMapTiles Server be used in High-Availability environment?

Yes.

OpenMapTiles Server supports health checks (the /health URL), so you can easily run multiple instances behind a load-balancer and set it up to automatically monitor the availability or even autoscale more instances if required.

If needed, you can also configure a reverse proxy to run in front of the OpenMapTiles Server. Just make sure that X-Forwarded-Host and X-Forwarded-Proto headers pass through, so the server can put correct URLs into the metadata JSONs and XMLs.