Hey, Taken from https://github.com/treeverse/charts/tree/master/charts/lakefs:

secrets.authEncryptSecretKey: A random (cryptographically safe) generated string that is used for encryption and HMAC signing

Should we reuse the same encryption secret key in all of our deployments? (will we lose access to our data in PostgreSQL / S3 otherwise?)

You need to use the same one. The key is used to encrypt/decrypt sensitive information - in case it doesn't match between servers, it will fail to decrypt data that was encrypted by other instance

Thanks